PC World Interactive 4/PC World Interactive 4.iso/share/masaustu/arj260x.exe/UPDATE.DOC

Text File | 1997-11-16 | 62KB | 1,407 lines

     UPDATE.DOC, ARJ 2.60 FULL RELEASE                        October 1997


     This documents new or updated information since ARJ 2.50.


     ** IMPORTANT NEWS ****************************************************

        The name of our company has changed to ARJ Software, Inc.

        ARJ Software, Inc. is now marketing two archiver products, ARJ
        and a new archiver JAR (JAR16/JAR32), that produces "J"
        archives which are not compatible with ARJ.  The 32 bit version
        of JAR (JAR32) supports the Windows NT operating system version
        3.50 and above as well as Windows 95.

        We have developed the new archiver, JAR, so that we could
        provide state of the art data compression with solid archiving
        techniques and new compression algorithms.  These improvements
        could not be added to ARJ without introducing serious
        compatibility issues with older releases of ARJ.  JAR16/32
        compresses significantly better than ARJ and PKZIP for many
        files and provides long filename support for both Windows 95 and
        Windows NT.  JAR16/32 duplicates much of ARJ's powerful
        functionality and provides new original functionality, too.
        However, it does not duplicate ARJ and it requires more system
        resources (memory and cpu power) to run.  See our web site for a
        copy of this archiver.

        Please note that it is our intention to continue supporting and
        enhancing the ARJ product.  There are a significant number of
        new features in this release of ARJ.  ARJ has the advantages of
        a large installed base, a simple archive format, significant
        third party software support, and a long history of reliable
        performance.  We also plan to provide ARJ support for Windows.

        The "ARJ y archive -jb0" command is NOW used to convert a chapter
        archive to a standard archive instead of using "-jb*".

        This version has been changed with regard to the storage of the
        SFX modules and the built-in help information.  The change now
        requires that MS-DOS 3.0 and above be used to access the SFX
        modules and the help information.  Under DOS 2.11, the help
        screens and self-extractor creation will work if ARJ.EXE is
        located in the CURRENT directory.  This change frees up more
        conventional memory for ARJ use.

        The mailing address of ARJ Software, Inc. has changed as of
        August 1993.

        ARJ Software, Inc.
        P.O. Box 249
        Norwood MA 02062
        USA

        FAX: [phone] as of September 1997

        EMAIL: [e-mail]

        There is ARJ Internet mailing list and WEB site support
        information added to the file ARJ.DOC.  They are excerpted below:

        http://www.ARJSOFTWARE.com                    (ARJ homepage)
        http://www.ARJSOFT.com                        (ARJ homepage)

        http://www.Dunkel.de/ARJ                      (German and English)
        http://www.glo.be/tsf                         (French and English)

        You can find information about the world of ARJ on the Internet
        by using various search sites including www.altavista.com and
        www.dejanews.com.

        Our credit card ordering procedures have changed.  We now
        process credit cards directly.

        ---------

        YEAR 2000 COMPLIANCE STATEMENT


        This version of ARJ as well as all previous versions are YEAR 2000
        compliant and will operate properly and with full functionality up
        to the year 2079.

        For more details, see ARJ.DOC.

        ---------

        This version of ARJ will use more conventional memory than
        previous versions of ARJ, but less than ARJ 2.55b.  However,
        using the "-hm1" or "-hm!" option will reduce your memory
        requirements especially when archiving a large number of files.

        ---------

        After ARJ version 2.41a, full functionality of a small set of
        ARJ software features will NOT be available in the shareware
        versions of ARJ (registered or not).  These features include the
        multiple volume self-extractor, the ARJSFX embedded command line
        feature, and the inhibit display messages option.  The full
        featured versions will ONLY be available from ARJ Software, Inc.
        and its agents.  Registered ARJ users can upgrade to this
        version for a small shipping/handling fee (five dollars) or a
        SASE with diskette.

        Check the WHATSNEW.DOC file for changes since ARJ 2.41a.

        ---------

        ** THIS VERSION OF ARJ HAS LONG FILENAME SUPPORT UNDER WINDOWS 95.
        ** REARJ NOW SUPPORTS LONG FILENAMES UNDER WINDOWS 95.

        Windows 95 DOS support (and therefore ARJ) do not support access
        to long filenames containing certain characters.  For example, a
        filename containing the copyright symbol or the trademark symbol
        cannot be accessed in a Win95 DOS window with the COPY command
        or with ARJ.  These type of filenames can only be accessed via
        their short names.  The Win95 system normally stores filename
        characters as two bytes per symbol allowing an alphabet of 65536
        possible symbols.  Because Win95 DOS only uses one byte per
        character position allowing only a 256 symbol alphabet, many
        characters are displayed by Win95 DOS as "_".

        With a workaround, ARJ will "extract" long filename archives to
        other operating systems that support long filenames (OS/2,
        WinNT, Linux). The "-hf1" option along with the "-ji" option
        allows extracting files to "temporary" files to be later copied
        to the original long filenames.  See the "-hf1" section for
        details.

        ---------

        This version now supports ARJ-SECURITY for multiple volume
        archives and multiple volume self-extractors.  ARJ-SECURE users
        should note the upgrade information above.

        ---------

        New to this version of ARJ is a data damage protection option.
        A slightly damaged/corrupted ARJ file can be repaired if the
        archive was protected by creating a data protection file before
        the damage occurred.  See below for more information.  The
        current competing PKZIPFIX programs offers NO protection against
        damage to actual file data.  PKZIPFIX fixes damaged archive
        directories.

        ---------

        New to this version of ARJ is the concept of backup CHAPTERS.
        This allows the user to do MULTIPLE full backups (up to 250) to
        a SINGLE archive in such a manner as to allow the full
        restoration of the files at the time of ANY of the backups
        (CHAPTERS).  This allows the user to backtrack easily, a feature
        valuable to software developers.  Deleted files are also
        accounted for in this chapter scheme.  Inherent in this concept
        is disk space savings.

        To go along with the new CHAPTER feature, ARJ now supports the
        UPDATE of multiple volume archives.  The "-hu" option is
        obsolete.  To implement this feature reliably in multiple
        volumes, all new or changed files are added at the END of the
        LAST volume.  This re-arrangement only occurs with multiple
        volume archives.  This prevents the diskette overflow that would
        occur with earlier versions of ARJ.  However, certain file
        attributes such as TEXT MODE may not be carried over to the
        updated file.

        Because of the new CHAPTER feature, ARJ NO LONGER SUPPORTS the
        old ARJ backup file feature.  This is the old "-jb / -jg"
        functionality.  This version of ARJ will not process this type
        of archive properly.  The CHAPTER feature is powerful than the
        ARJ backup feature.

        See the "ac" command and "-jb" option for more information about
        CHAPTER archives.

        ---------

        New to this version is the "hollow" archive.  This is an ARJ
        archive that does NOT contain the compressed file data.  The
        main application for this kind of archive is scanning for
        CHANGED files.  This makes the hollow archive useful for file
        integrity scanning as in virus damage scanning.  However, this
        feature should not be used solely in place of a anti-virus
        program.

        ---------

        This version of ARJ provides a new encryption scheme based upon
        the Russian encryption algorithm (GOST 28147-89 cipher).  This
        algorithm is similar in design to DES; however, GOST is designed
        for software implementation.  GOST 28147-89 uses a 256 bit key
        and 32 rounds of encryption.  In addition, this implementation
        of GOST also uses the 64 bit cipher feedback mode.

        This new encryption is accessed by using the "-g" option to
        specify the password and the "-hg" option to specify the new
        scheme.  This new scheme is in addition to the older XOR garble
        scheme.

        ** Please NOTE that losing your password means losing your file!
        ** Please DO NOT ask for technical support on lost passwords.
        ** There is no shortcut/backdoor for determining lost passwords.

        The encryption module is a separate COM file named ARJCRYPT.COM.
        ARJ expects to find the encryption module in the same directory
        as itself.  This has the advantage of saving space with the
        ARJSFXV module and the DEARJ.EXE module when encryption is not
        needed.  You simply do not include the encryption module in the
        archive when not using encryption.

        For non-USA users, the encryption overlay module is not included
        with this version of ARJ.  Because of USA export regulations,
        ARJ Software, Inc. may not export the encryption overlay module
        from the USA.

        ---------

        ARJ can archive up to 65,000 files at one time when the "-hm"
        option is specified.  This option enables ARJ to use disk space
        instead of memory space to manage the names of the files being
        archived.  The "-hm!" option uses XMS memory to manage the list
        of names.  At this revision of ARJ, checking for duplicates is
        NOT disabled as it was in 2.50.

        ---------

        ARJ can now select files based upon the file attributes and/or
        file types.  For example, you can build an archive that contains
        ONLY the directories and NOT the files on your hard drive.  See
        the "-hb" option for details.

        ---------

        The multiple volume SELF-EXTRACTION FUNCTION is LIMITED in the
        ARJ shareware version.  Only volumes of 360K or less in size can
        be created AND only such volumes will be processed by the
        self-extractor.  This feature is accessed through the "-je"
        option along with the "-v" option.

        This multiple volume self-extractor supports ANSI escape
        sequence displays.  It also supports ARJ-SECURE over multiple
        volumes and the new encryption method.

        ---------

        The extraction "-jo" option now works in cooperation with the
        "-f" and "-u" type options.  Previously, the "-jo" option
        disabled the "-f" and "-u" options.

        ---------

        The "-g" option will NOW force compression even when a size
        increase results except when the "-m0" option is used.
        Encrypted compressed data is more secure than encrypted stored
        (-m0) data.

        ---------

        This version no longer detects the older 2.30 ARJ-SECURE archives.

        ---------

        ** CAUTIONS **

        Whenever archiving to diskettes, it is HIGHLY recommended that
        the option "-jt" be used.  This helps spot BAD diskettes or BAD
        diskette drives.  It is HIGHLY recommended that the "-jt" option
        be used in a Windows or multi-tasking or network environment.

        The XMS accelerator in Hurricane 2.0 MAY interfere with the use
        of the ARJ -hm! option within a Windows DOS box.  You can use
        the -hm option instead.

        UNERASE or UNDELETE commands do not always recover a file
        correctly.  This will result in damaged archives.  This is true
        for all archive types.  You should always test an archive after
        unerasing it.

        CAUTION: To those who use the "-t1" and/or "-t1g" options to
        save a few extra bytes.  This option should only be used on TEXT
        FILES. Those are files created by EDLIN, EDIT, QEDIT, BRIEF,
        NOTEPAD, and others.  Text files typically contain only letters,
        numbers, spaces, and punctuation marks.  WORD PROCESSOR format
        files ARE NOT TEXT FILES!  MS WORD, Wordperfect, AMIPRO, WRITE,
        and similar files ARE NOT TEXT FILES. Using the "-t1" or "-t1g"
        on any other kind of file probably will result in DATA LOSS!

     **********************************************************************


     WINDOWS 95 LONG FILENAME SUPPORT

        This version of ARJ supports the use of long filenames under the
        Windows 95 in the MS-DOS Prompt environment.  It does NOT support
        long filenames under MS-DOS 6.22 and below.  It supports long
        filenames ONLY when the Windows 95 GUI (graphical user interface)
        is running.  In other words, there is no long filename support in
        Windows 95 MS-DOS mode (accessed from the Win95 shutdown menu).

        The small ARJ self-extractor (-je1) does NOT support the handling
        of long filenames.

        The ARJSFX and ARJSFXV modules (-je) support long filename
        handling.  However, they will only extract archived Win95 long
        filename files under Win95.  If long filename files are being
        extracted to plain DOS, an error message will be displayed.  They
        can be forced to extract the Win95 archived files with the "-j"
        option.

        For compatibility with MS-DOS and older versions of ARJ, ARJ can
        create a dual-name compatibility ARJ archive.  This is an archive
        with both shortnames and longnames stored in it.  The longnames are
        stored in the file comment field.  New versions of ARJ will treat
        the dual-name archive according to the operating system
        environment.  In other words, under MS-DOS, a dual-name archive
        will look like a shortname archive.  Under Win95, a dual-name
        archive will look like a longname archive.  This is also true of
        the ARJSFX and ARJSFXV modules (-je).

        For efficiency reasons ARJ does not repeatedly check for file
        system support of long filenames.  ARJ only tests the "C:" file
        system.  An error may occur if ARJ under Win95 tries to access a
        disk drive that does not support long filename handling.  The "-hf"
        option can be used to force ARJ to use the standard 8.3 filename
        APIs instead of the longname APIs.

        There are four new options "-hf", "-hf1", "-hf2", and "-hf3" that
        provide choices in the handling of long filenames.  See the
        discussion of those options below for more information.

        ARJ will save Win95 long filenames in the letter case they are
        stored on disk; however, all filename matching is done without
        regard to case.  In other words, "ThisName.Ext" matches
        "thisNAME.ext".

        When archiving files under Windows 95, be sure to EXCLUDE files
        from processing that are OPEN such as WIN386.SWP.

        REMINDER: When specifying filenames with embedded blanks or
        symbols like ">", "<", or "|" on the command line, you MUST
        quote the filenames.

        Examples:  ARJ a archive "C:\Program Files\*.*" -r
                   ARJ c archive "<<<*" -jz -jb

        However, please note that ending a quoted filename with a "\"
        will not work as expected.  The "\" before a special character
        will quote it literally.  The string \" will result in a literal
        double quote mark.  This is not a feature of ARJ.

        Example:  "C:\Program Files\"   will be translated to
                  C:\Program Files"

        You will need to use two backslash marks as in "\\".

        Example:  "C:\Program Files\\"

        For Windows 95 disaster recovery, we make use of the program
        DOSLFNBK.EXE 1.5 by D. J. Murdoch.  With this program while in
        plain DOS, you can save all of the long filenames to BACKUP.LFN.
        Then you can use ARJ or any other DOS backup scheme to backup
        your system including the BACKUP.LFN.

        CAUTION: DOSLFNBK 1.5 may not work on all Windows 95 versions.
        It apparently does NOT WORK on VFAT32 Windows 95.

        Here is a brief list of steps to backup and restore:

        1) Make a Win95 startup diskette if you do not have one.
        2) Shutdown to MS DOS mode.
        3) While you are on the C: drive, execute "DOSLFNBK C:\".
           Change to the D: drive (if any) and execute "DOSLFNBK D:\".
           Execute DOSLFNBK for each drive on each drive.
        4) Use ARJ or other DOS backup program to backup ALL of the files.
           Example:  ARJ a A:backup C:\*.* D:\*.* -r -a1 -jt1 -va -jf
           CAUTION: For important backups, we always make TWO BACKUPS of
           my system.  All too often, one or more files will not restore
           correctly because of some data error (MURPHY'S LAW in action).
        5) Save ARJ.EXE or your backup program to diskettes in a
           restorable form.
        6) Backup finished.


        1) Boot from your Win95 startup diskette.
        2) Execute "SYS C:" from the A: drive to re-install the boot.
        3) Install ARJ.EXE or your backup program on the hard drive.
        4) Restore all of the files.
           Example:  ARJ x A:backup -v -jf -y -ha
        5) On each drive, execute "DOSLFNBK /r" to restore the long
           filenames.
        6) Restore finished.


     ARJ RESPONSE FILE PROCESSING

        ARJ will accept an ARJ command line from a response file as in
        "ARJ @command.rsp".  The "@" symbol indicates that the appended
        name is the name of the response file.  In this case, the file is
        command.rsp. The response file symbol cannot be changed.

        The response file should contain the ARJ command line minus the
        initial "ARJ".  The command line may be split over as many lines
        as necessary.  The response file feature will NOT accept QUOTED
        command line options.  Options with embedded blanks ("-vasTEST X")
        will not be processed as expected.  See the "-@" option for
        help on options with blanks.  When using the response file feature,
        ARJ will accept only the "-+", and "-&" switch options on the DOS
        command line along with the response file name.  All other command
        options must be specified in the response file or in the ARJ
        environment variable.

        To better support long filenames, ARJ provides the "-@" option to
        handle the processing of filenames and switch options that contain
        embedded spaces.  The "-@" switch option enables the interpretation
        of a text line in an ARJ response file as a single token.  In other
        words, when ARJ scans an "-@" option, it will process the NEXT text
        line in the response file as a single token including all embedded,
        leading, and trailing blanks.  ARJ will continue to process each
        subsequent text line in the same manner.  If ARJ scans a subsequent
        "-@" option, ARJ will revert to its normal multiple tokens per line
        processing.


     ARJ WILDCARDING

        As of 2.55c, the list of filenames that ARJ builds internally for
        archiving is now affected by the "-o" and "-b" options.

        Prior to 2.55c, ARJ would include all matching filenames in its
        internal list regardless of the "-o" and "-b" settings.  Then
        during archival, ARJ would select from its internal list based upon
        the "-o" and "-b" options.

        Now ARJ uses the "-o" and "-b" and "-hb" options while it is
        building the internal list.  The advantage with this method is the
        need for less memory to handle fewer files.

        For example, when doing a full backup of the C drive, ARJ builds an
        internal list of filenames for all of the files on drive C.  When
        doing an incremental backup (-b, -b1), ARJ builds a list of
        filenames for only the files that have the archive bit set.  In
        prior versions of ARJ, ARJ would build the same list regardless of
        the "-b" setting.

        ARJ wildcarding can differ according to the operating system
        environment.  When scanning the file system for filenames to
        add/update an archive, ARJ uses the internal operating system
        wildcard matching functions. When scanning an ARJ archive (list,
        extract and so on), ARJ uses its own wildcard matching function.
        This internal ARJ function is identical to the standard DOS
        wildcard matching.

        Windows 95 and Windows NT use a slightly more complex wildcard
        matching function.  In Windows 95, it is possible to specify a
        wildcard specification of "a*d*c".  This would match ARJ.DOC,
        ARJDISP.DOC, and others.

        As of ARJ 2.55c, ARJ will handle up to 65,000 filenames. Because
        ARJ checks for duplicate filenames when necessary, processing over
        20,000 filenames may slow down as the number of filenames processed
        increase.  ARJ processes wildcards most efficiently when specified
        as separate command line wildcards inclusive of drive letters.

        Example: ARJ a backup C:\*.* D:\*.* E:\*.* -r -a1

        If each drive letter is unique, ARJ will not need to check for
        duplicates and can proceed faster.  This speedup does not work when
        using listfiles.


     ARJ-PROTECT DATA PROTECTION FEATURE

        With this version, ARJ can repair "protected" archives that suffer
        from slight amounts of data damage (CRC error, bad header, etc). An
        ARJ archive is "protected" with the "-hk" option.  With the "-hk"
        option, ARJ will generate a separate ARJ data protection file. This
        protection file is REQUIRED in order to repair damaged ARJ
        archives.  The size of this file ranges from a minimum of 4096
        bytes and upwards.  For larger archives, the protection file size
        is typically less than one percent of the archive file size.

        For this release, the protection file is a separate file.  This
        avoids the problem of uploading unnecessary data to BBSes and ftp
        sites.  The name of the protection file is based upon the archive
        name plus the extension ".XRJ".  Volume protection filenames end
        in ".X01", etc.

        This protection feature is sector based and allows repair due to
        typical types of disk corruption (bad sector, virus damage, cross
        links, etc).  This type of sector protection is NOT effective for
        most data transmission problems where data is missing from the
        middle of a transmission.

        Technically, this protection feature uses a series of XOR sums and
        checksums in order to allow repairs.  Larger archives are logically
        treated as several streams of data.  ARJ can protect each "stream"
        from one or two damaged sections 1024 bytes in size.  However, for
        large archives (1 MB or larger) ARJ can sometimes repair up to four
        damaged sections per MByte.  The "-hk1, "-hk2" ... "-hk9" options
        can offer more data protection at the cost of a proportionately
        larger protection file.

        This type of protection is NOT offered by the current competing
        PKZIPFIX program which only repairs damaged archive directories.

        The "-hk" option sets ARJ to build a protection file.  The "q"
        command is used to repair a damaged archive.  The repaired archive
        is named ARJFIXED.ARJ.

        Example:  ARJ a archive -hk       generates archive.xrj
                  ARJ q archive           repairs archive.arj


     ARJ ANSI COMMENT HANDLING

        As of 2.55, ARJ will use its own ANSI sequence display handler
        to display ARJ comments.  In previous versions, ARJ depended upon
        the "-ja" option and an installed ANSI.SYS driver to handle the
        ANSI escape sequences.  The "-ja" option has a new function now.
        The "-ja" option will set the "P" command to display files using
        the new ANSI sequence display handler.

        The ARJSFXV module (-je -v) also will display ANSI comments now.

        Please note that the ARJ comment field size is limited to about 2K
        bytes.


     ARJSFXV MULTIPLE VOLUME SELF-EXTRACTOR

        This module now supports ARJ-SECURE and ANSI escape sequences in
        the archive comment.  You can build a single volume
        self-extracting archive by specifying a larger volume size.  The
        ARJ distribution archive uses the ARJSFXV module because of the
        ANSI comment support.

        Example:  ARJ a archive *.* -je -v300K


     ARJ ERRORLEVELS

        ARJ will now return a DOS error code of 11 for a user control break
        action.  ARJ formerly returned a code of 2 for this situation.

        ARJ will now return a DOS error code of 12 when trying to modify a
        chapter archive that already has 250 chapters in it.  ARJ formerly
        returned a code of 2 for this situation.


     ARJ COMMANDS

     "ac" command

        This is a new two character command for ARJ.  It is actually an
        abbreviation for the following command and switch options:
        "u -u2 -jb".  The "ac" command will add a chapter backup to a new
        archive or add a new chapter (updating) to a chapter archive. A
        chapter backup will consists of files that are DIFFERENT (different
        date-time or size).

        Example:  ARJ ac archive c:\dir\*.* -r -jt

        The advantage of a chapter archive is that you can make numerous
        full backups (chapters) to a SINGLE archive.  Major space savings
        will result when some files do not change from backup to backup.

        See the "-jb" option for more details.

        Adding a new chapter adds a chapter label entry in the archive.

        There is a limit of 250 chapters per archive.

        Please note that the "ac" command abbreviation is dependent upon
        file sizes and file date-time stamps.  Modifying file date-time
        stamps with no relation to the system time may cause chapter update
        problems.  In addition, changing the system time significantly may
        also cause chapter update problems.


     "cc" command

        This is a new two character command for ARJ.  It is actually an
        abbreviation for the following command and switch option:
        "y -jb".  The "cc" command will convert a standard ARJ archive to a
        chapter archive.

        Example:  ARJ cc archive


     "dc" command

        This is a new two character command for ARJ.  It is actually an
        abbreviation for the following command and switch option:
        "d -jb".  The "dc" command will delete the last chapter in an
        archive using the specified file wildcard.  Normally, that
        wildcard should be "*.*".

        Example:  ARJ dc archive *.*


     "e" command
     "x" command

        Chapter archives do NOT support extraction with deletion.

        ARJ x archive *.doc -d   generates "Bad command syntax"


     "q" command

        The "q" command is used to repair a damaged "protected" archive.
        An archive is protected with the "-hk" option.  Both the protected
        archive and its ARJ-PROTECT data protection file are required to
        repair any damage.  The "q" command will attempt to repair all
        damages and put the repaired archive in a file named ARJFIXED.ARJ.

        Example:  ARJ q archive

        When working with a damaged archive and the "Abort, Retry, Ignore,
        Fail" prompt appears, you should select the "Ignore" option.


     "t" command

        When used with the "-hk" option, ARJ will test the archive and
        upon successful completion, will generate the ARJ-PROTECT file.

        Example:  ARJ t archive -hk


     "y" command

        When used with the "-g" option and optionally the "-hg" option,
        ARJ will ungarble a previously garbled archive.

        Example:  ARJ y archive -gpasswrd

        When used with the "-jb" option, ARJ will convert a standard
        archive to a chapter archive.

        Example:  ARJ y archive -jb

        When used with the "-jb0" option, ARJ will convert a chapter
        archive to a standard archive.

        Example:  ARJ y archive -jb0


     ARJ SWITCHES

     "-@" switch

        This switch sets ARJ to enable/disable the interpretation of text
        lines in an ARJ RESPONSE file as a complete single token. Normally,
        in an ARJ response file, blanks are interpreted as token
        separators.  (Tokens are commands, filenames, wildcards, and switch
        options).  However, if ARJ scans an "-@" option in a response file,
        it will process subsequent text lines as single tokens per line.  A
        subsequent "-@" option will revert ARJ to normal multiple tokens
        per line mode.

        Example:  ARJ @text.rsp

        TEXT.RSP contains:
        a c:\dir\archive -r -jt1 -@ -a1
        c:\long directory name\*.*
        c:\other directory name\*.*
        -@
        dir1\*.* dir2\*.* dir3\*.*

        One common error when using the "-@" option is including extraneous
        leading and/or trailing blanks.  For example, ARJ will abort with
        an invalid switch option error if the second "-@" above has one or
        more trailing blanks.


     "-#" switch

        For consistency, ARJ now interprets the file spec "10-" as 10 to
        the end of the archive.

        Example:  ARJ l archive -# 21000-       means file 21000 to end


     "-b" switch

        Under Windows 95, the use of the "-b" type switch options to reset
        the archive bit may result in a sharing violation error.  Under
        ARJ 2.55b and above, ARJ will display the error and then proceed
        ignoring the error.


     "-e" switch

        This switch used during extraction will exclude the beginning
        characters of the filename.  This can be useful for shortening a
        long output pathname.

        Examples:  ARJ x archive -e10  will exclude the first 10
                                       characters of the output filename.

                   ARJ x archive -e4   will exclude the first 4 characters.


     "-f1" switch

        This switch is used to select files that are OLDER for extracting
        or adding.


     "-f2" switch

        This switch is used to select files that are DIFFERENT (different
        date-time or different size) for extracting or adding.

        There is a slight limitation to this switch.  When processing
        files that are split across volumes, the size test is skipped
        and the file is updated regardless.


     "-f3" switch

        This switch is used to select files that are CRC mismatches or
        different sizes for extracting or adding.  The 32 bit CRC
        (checksum) of the file is matched against the CRC of the file in
        the archive.

        There is a slight limitation to this switch.  When processing
        files that are split across volumes, the CRC test is skipped
        and the file is updated regardless.


     "-g" switch

        The garble option in this version of ARJ has two versions. One
        is the original version found in earlier ARJ releases.  It is
        compatible with older versions and works like those versions.

        The other garble version uses a separate encryption module.

        This new option is accessed by using the new "-hg" option.  This
        option sets ARJ to use the separate encryption module to encrypt
        the data.  By default, ARJ will look for the file "ARJCRYPT.COM"
        in the same directory where the ARJ.EXE being executed is found.
        The user may specify the pathname of the module to use.

        Examples:  ARJ a archive *.doc -gThis_is_a_password -hg
                   ARJ a archive *.doc -gpassword -hgc:\dir\enc.com

        The new garble option accepts a password key up to 32 characters
        long.  Excess characters are ignored.  Garble passwords ARE CASE
        SENSITIVE!  DO NOT LOSE your password!  There is no known method to
        recover the password other than by brute force, which could take a
        very long time.  The longer the password, the longer it would take
        to "guess" it.

        This new encryption scheme is not compatible with the "-g" option
        of pre-2.55 versions of ARJ.  If you want to maintain compatibility
        with pre-2.55 versions of ARJ, you should NOT use the "-hg" option.

        Only the multiple volume self-extractor supports the new encryption
        module.

        When garbling or ungarbling an existing archive, ARJ will detect
        the method of encryption previously used and select that same
        method regardless of whether the "-hg" option is specified or not.


     "-i3" switch

        This switch shows the percentage progress of the WHOLE archive
        build.  This switch is only operative during adds.


     "-i4" switch

        This switch shows the percentage progress as a bar graph of the
        WHOLE archive build.  This switch is only operative during adds.


     "-i5" switch

        This switch shows the percentage progress including a bar graph
        of the WHOLE archive build.  This switch is only operative during
        adds.


     "-i6" switch

        This switch shows the percentage progress of the WHOLE archive
        build along with a progress bar graph for the current file.  This
        switch is only operative during adds.


     "-s3" switch

        This switch sets ARJ to keep both the original archive file
        time-stamp as well as the original internal archive modified
        time-stamp when modifying the archive.

        This feature is helpful when adding a copy of the data damage
        protection file to the "protected" archive.  Using this switch,
        you can add a file to an archive and then remove that file and
        end up with the original archive.  This is necessary because any
        change in archive contents would be perceived as damage by the
        ARJ "q" (repair archive) command.

        Example:   ARJ a archive *.doc -hk
                   ARJ a archive archive.xrj -s3
                   ARJ e archive archive.xrj -d -s3
                   ARJ q archive

        The above sequence of commands replicates a situation where the
        user embeds a copy of the data damage protection file into the
        "protected" archive.  In the case of slight archive damage, the
        protection file can be extracted and used to recover damaged data.


     "-u1" switch

        This switch is used to select files that are OLDER or NEW for
        extracting or adding.


     "-u2" switch

        This switch is used to select files that are DIFFERENT (different
        date-time or different size) or NEW for extracting or adding.

        There is a slight limitation to this switch.  When processing
        files that are split across volumes, the size test is skipped
        and the file is updated regardless.


     "-u3" switch

        This switch is used to select files that are CRC mismatches or NEW
        for extracting or adding.  The 32 bit CRC (checksum) of the file is
        matched against the CRC of the file in the archive.

        There is a slight limitation to this switch.  When processing
        files that are split across volumes, the CRC test is skipped
        and the file is updated regardless.


     "-v" switch

        For specifying sizes for this option, ARJ will accept the "M"
        modifier to multiply by 1,000,000 (one million).

        Examples:  ARJ a vol -v100M
                   ARJ a vol -vr1M1440


     "-hb" switch

        This switch is used to select by file attribute or file type.

        The "-hb" option can be used to select files by their attributes
        (normal, readonly, hidden, system, directory, and archive bit).
        "Normal" is defined as files that are NOT the following: readonly,
        hidden, system, label, chapter header, or directory.  For
        extract/list operations, you can also select chapter labels and
        volume labels.  By default, the "-hb" option by itself selects all
        types of files.  If you specify a letter symbol representing a file
        type, you are selecting ONLY that type of file.  You can specify a
        series of letters representing all of the file types that you want
        to select.  For example, the "-hbdr" option selects both
        directories and readonly files.  Selections are additive.

        Example: -hbnr   select only normal and readonly files

        Single letters represent each attribute or type.
          a - archive bit set
          b - archive bit clear
          h - hidden
          r - readonly
          s - system
          d - directory
          n - normal files (not d, h, r, s, l, c)
          l - volume label
          c - chapter label
          f - abbreviation for "ndhrs"

        The archive bit selection ("a" or "b") is a special case.  If you
        have selected no types of files EXCEPT files with the archive bit
        set, ARJ will select from the set of all file types. If you have
        selected one or more file types, ARJ will select based upon the
        archive bit from the selected set of files types.

        Examples: -hbhrsa      select hidden, readonly files with archive
                               bit set
                  -hba         select all files with archive bit set

        Add/update options  : f, d, r, h, s, n, a, b.

        Extract/list options: f, d, r, h, s, n, a, b, c, l.

        Examples:  ARJ a archive *.* -r -hbrs     select only readonly
                                                  and system files
                   ARJ a archive *.* -r -hbd      store only directories
                   ARJ l archive *.* -hbr         list only readonly files
                   ARJ l archive -jb* -hbc        list chapter headers

        Notes:  The option "-hb" with no letter options is an abbreviation
        for "-hbndhrslc" (everything).


     "-hf" switch

        This switch disables Windows 95 long filename handling.  ARJ will
        use the standard DOS 8.3 APIs (DOS shortnames) to do its
        processing.  Files so archived with this switch can be extracted
        under Windows 95 and DOS.

        This switch can be used while listing a dual-name archive under
        Win95 to list/process the shortnames.


     "-hf1" switch

        This switch in Win95 during archival sets ARJ to build a dual-name
        compatibility archive by storing the shortname in the filename
        field and the longname in the file comment field, so that both long
        filenames and short filenames are stored in the archive.

        The file system is wildcard scanned using longname wildcards.

        Such a dual-name archive is compatible with older versions of ARJ.
        New versions of ARJ process such an archive according to the
        current operating system environment.  Under Win95, the long
        filenames in the archive are used.  Under MS-DOS, the short
        filenames are used.  This processing is automatic for this release
        of ARJ.

        The "-e1" option does not affect the short name that is stored.


        During extraction this switch sets ARJ to extract files from a
        Win95 archive (built without "-hf" option) by using generated
        names.  ARJ will generate a short name based upon "W95LNAME.000"
        and its sequence number in the archive.

        Specifying the "-ji" option with an index filename along with
        "-hf1" will generate an index file with the W95LNAME.000 names and
        the associated long filenames.  The long filenames are quoted.

        Example:  ARJ x archive -hf1 -jiindex.log

        This option with "-ji" can be useful when trying restore long
        filenames on a system that allows long filenames such as OS/2,
        WinNT, or Linux.

        Please note that modifying a dual-name archive outside of Windows
        95 is possible but it may produce an archive with some dual-names
        and some not.

        The "-hf1" option has no effect on a dual-name archive during
        extraction.


     "-hf2" switch

        This switch sets ARJ to attempt to extract using the long filenames
        stored in the archive.  No modification is done to the long
        filenames except by DOS itself.  This switch also sets ARJ to use
        the standard DOS 8.3 APIs for processing.  Because of the
        shortening of the filenames by DOS, duplicate filenames may result.

        You would typically use this option when transferring files from
        a Win95 system to a DOS system.


     "-hf3" switch

        This switch in Win95 during archival sets ARJ to build a dual-name
        compatibility archive by storing the shortname in the filename
        field and the longname in the file comment field, so that both long
        filenames and short filenames are stored in the archive.

        This is similar to the "-hf1" switch functionality EXCEPT that ARJ
        wildcard scans the file system using shortname wildcards.

        This switch provides a way of archiving files that have Win95 DOS
        inaccessible symbols in them like the copyright and trademark
        symbols.  Win95 DOS displays those filenames with the "_"
        character.  ARJ will store the long filename with the "_" character
        as is.  However, this means that a restore of the archive will not
        restore the filename as it was with the inaccessible copyright or
        trademark symbol.  It will be restored with a "_" symbol.


     "-hg" switch

        This switch is used to specify the filename of the encryption
        module to be used when encrypting a new archive.  The default
        filename is "ARJCRYPT.COM".  ARJCRYPT.COM contains a new encryption
        scheme that is incompatible with earlier releases of ARJ.  ARJ will
        look for the encryption module in the directory that contains the
        copy ARJ.EXE that is being executed unless the specified module
        name contains a path symbol "\" as in "ARJ\OLDCRYPT.COM".  If you
        want to use a module in the current directory, you should specify
        the name as in ".\ARJCRYPT.COM".  The "." indicates the current
        directory.

        With an existing archive, ARJ detects the encryption scheme that
        was used to encrypt the archive and uses the same scheme regardless
        of whether the "-hg" option is specified or not.


     "-hk" switch

        The "-hk" switch sets ARJ to create an ARJ-PROTECT data protection
        file.  This file is named similarly to the created archive except
        for an "X" in the beginning of the file extension as in NAME.XRJ.
        This ARJ-PROTECT file contains necessary information to repair
        damage to the original archive.  The "-hk1", "-hk2" ... "-hk9"
        options will generate larger ARJ-PROTECT files affording a higher
        probability of a successful repair.

        If the archive already exists, an ARJ-PROTECT data file can be
        created via the "t" command.

        Example:  ARJ t archive -hk            builds archive.xrj file

        For users who do not like the separate protection file feature,
        there is a work-around.  Using the new "-s3" option (keep original
        time-stamps), the user can add the ARJ-PROTECT file to the
        protected archive and extract it later for repair purposes.

        Example:  ARJ a docs *.txt -hk          builds protected archive

                  ARJ a docs docs.xrj -s3       inserts protect file

                  ARJ e docs docs.xrj -s3 -d    extracts and removes
                                                protect file restoring
                                                the original archive

                  ARJ q docs                    repairs archive


     "-hm" switch

        The "-hm" switch sets ARJ to transfer the list of filenames to be
        archived from the limited conventional memory to file storage.
        This allows a much larger number of files to be processed (over
        65,000).  This option is ignored for all ARJ commands except
        "a", "f", "j", "m", "u".

        Normally, this switch sets ARJ to wait until it is out of memory
        storing filenames into a list before transferring that list to a
        temporary file.  That temporary file is put in the current
        directory or the special work directory if specified (-hm!F:\) or
        XMS memory is specified (-hm!).

        However, there may be a few cases where ARJ will run out of memory
        doing other tasks while it is storing this list.  In these cases,
        ARJ will abort.  The user can specify a numeric argument of "1" to
        this switch to force ARJ to transfer the list to file storage
        immediately.

        The "-hm" work directory is specified by appending a "!" to the
        "-hm" or "-hm1" options and then appending the filename to the
        option.  See below.

        Examples:  ARJ a archive c:\*.* -r -hm
                   ARJ a archive c:\*.* -r -hm1
                   ARJ a a:archive c:\*.* -r -va -hm500!F:\
                   ARJ a a:archive c:\*.* -r -hm!G:\temp\

        The use of a RAMDISK directory will provide the fastest operation.


     "-hm!" switch

        The "-hm!" option with no pathname appended to it will set ARJ to
        store its list of filenames in XMS memory.  List processing will be
        faster using XMS memory as opposed to using disk space.  If no XMS
        memory is available, ARJ will use conventional memory and then disk
        space if needed.

        If there is not enough XMS memory available for the internal list,
        ARJ will abort.  The XMS accelerator in Hurricane 2.0 for Windows
        may interfere with this switch while in Windows.


     "-hq" switch

        This switch sets ARJ to ignore the error that occurs when ARJ
        cannot open a file for lack of permitted access during an add-type
        command and/or a compare command.  This is DOS error code 5. This
        option applies only to files being added to a new archive and/or
        being compared.  For an existing archive, this option will be
        ignored during the add operation, but NOT during a subsequent
        compare operation.

        Typically, this switch would be used during network access or in
        Windows 95 where a file is open for exclusive use by another
        process.  Normally, in this situation, ARJ would return a non-zero
        DOS error level.  However, if this switch is specified, ARJ will
        NOT return a non-zero error level due to this specific open
        failure.

        If you use the "-ji" option to set up an index file, ARJ will log
        any file that it cannot open.


     "-hq1" switch

        This switch sets ARJ to ignore the error that occurs when ARJ
        cannot open a file because it cannot be found during an add-type
        command and/or a compare command.  This is DOS error code 2.  This
        option applies only to files being added to a new archive and/or
        being compared.  For an existing archive, this option will be
        ignored during the add operation, but NOT during a subsequent
        compare operation.

        This open error typically happens when a temporary file that ARJ
        has found to archive is purged by another process before ARJ can
        actually open and compress/compare it.  This is not the same error
        as when a user specifies a filename on the command line and ARJ
        cannot find it.

        If you use the "-ji" option to set up an index file, ARJ will log
        any file that it cannot open.


     "-hq2" switch

        This switch sets ARJ to ignore both the no access error and the
        not found error during an add-type command for new archives as
        above.


     "-ht" switch

        This switch is provided as an alternative to the standard method of
        specifying a target directory.  This new option can be specified in
        the ARJ configuration file or in the ARJ_SW environment variable as
        well as on the command line.

        Examples:  ARJ x archive *.* -htD:\DESTDIR
                   SET ARJ_SW=-hf -htD:\DESTDIR


     "-j#" switch

        This switch allows the building and testing of a special ARJ
        "HOLLOW" archive that is missing the actual compressed file
        contents.  This allows the creation of small archives for CRC
        testing against the CRCs of actual files.  This is suited for
        special applications. Please take note that NO actual file data can
        be extracted from these "HOLLOW" archives.

        For example, a user has transported a directory of files from one
        PC to another PC.  At a later time, that user would like to
        determine which files have actually changed their contents
        regardless of the date-time stamps.  That user could archive the
        original directory using the -j# switch which builds the ARJ
        "hollow" archive with the sole exception that no compressed data is
        stored with the archive.  This allows the rapid building of a much
        smaller archive.  The file CRC is computed and stored in the
        archive.  This new "hollow" archive is transported to the other PC.
        A simple ARJ test command with the "-jt1" option on the other PC
        would point out files whose content's CRC do not match.

        Another use of this "hollow" archive is for FILE INTEGRITY
        checking.  You can create this "hollow" CRC archive and use it at a
        later time to determine if any files have been corrupted or damaged
        by VIRUS or system problems.

        Please note that there is a VERY SMALL possibility that a file has
        been changed and its new 32 bit CRC still matches.  That
        possibility is approximately one in four billion.

        The -j# option during an ARJ archive build will set the compression
        method to 9.  The only change is that the file header will indicate
        that the compressed file size is ZERO.  Otherwise, the file header
        is the same as in an archive where the file was actually compressed
        and stored.

        To use this "hollow" archive to test CRCs against actual file CRCs,
        use the following syntax:

        Syntax:  ARJ t archive_name -jt1
                 ARJ t archive_name target_dir\ -jt1

        The second command above is used where the relative pathnames
        stored in the archive do not match up with the current directory.
        See the discussion in ARJ.DOC for more information on the option
        "-jt".

        When ARJ displays "NOT matched" for a "hollow" archive, it means
        the file size in the archive and the size of the actual file do NOT
        match.


     "-j#1" switch

        This option differs from the "-j#" option in that the 32 bit CRC is
        NOT stored.  The compression method is set to 8.


     "-ja" switch

        This switch has acquired NEW functionality.  Its OLD function was
        to set ARJ to fully display ANSI escape sequences.  It now is used
        with the "ARJ p" command to display files using ARJ's own ANSI
        display handler.  ANSI.SYS is no longer needed.

        Example:  ARJ p ansifile -ja -q


     "-jb" switch

        This switch sets ARJ to build a chapter archive.  Once an archive
        is set to a chapter archive, all subsequent processing will
        continue to treat it as a chapter archive.

        The advantage of a chapter archive over a series of separate
        archives of the same set of files is that space can be saved when
        archived files do not change.  A single chapter archive can produce
        the same results as one hundred standard archive backups.  In other
        words, one can update a chapter archive one hundred times and fully
        recover any one of those updates.

        Technically speaking, each file in a chapter archive has a chapter
        lifespan range.  When a file is backed up and has not changed since
        the last backup, only the lifespan range is changed.  A copy of the
        file is NOT added to the archive since a copy already exists in the
        archive.  If the backed up file is different from the previous
        version, then that file is added to the archive with an appropriate
        chapter range. The previous version of the file is still kept in
        the chapter archive.  When a particular chapter is restored, ARJ
        selects only the files whose lifespan includes the chapter number
        requested.

        As an example, suppose one made a series of daily chapter backups
        of a document directory where only one document out of the one
        hundred documents changes on a daily basis.  The chapter archive
        would contain the original one hundred documents plus a copy of
        each day's changed document.

        When processing chapter archives, all ARJ add type commands
        (A,M,F,U) will create a new chapter in the chapter archive.  Up to
        a maximum of 250 chapters can be stored in a single archive. The
        proper way to build and update a chapter archive is with the "ac"
        command.  You should use the same command line arguments for each
        chapter update.  If you fail to select the same files as before,
        the chapter archive will not update the lifespan ranges properly
        and those unselected files will "appear" to have been deleted for
        the current chapter.  By default, the "ac" command will update a
        chapter archive with files that are DIFFERENT from the previous
        chapter (different size or date-time stamp).  The "ac" command is
        actually an abbreviation for the following command and options: "u
        -u2 -jb", so you CANNOT use the "-u" or "-jb" options with the "ac"
        command.

        ARJ ac archive dir\  *.txt *.doc *.wri      initial build
        ARJ ac archive dir\  *.txt *.doc *.wri      second chapter
        ARJ ac archive dir\  *.txt *.doc *.wri      third chapter
        ARJ ac archive dir\  *.txt *.doc *.wri      fourth chapter
        ARJ ac archive dir\  *.txt *.doc            fifth chapter will
                                                 be missing all *.wri files

        An expert with ARJ may want to use the actual commands and switches
        instead of the "ac" command.

        ARJ u -u2 -jb archive dir\ *.txt

        It is possible to change a standard ARJ archive to a chapter
        archive with the "y" command and the "-jb" option.  The opposite is
        possible with the "-jb0" option.

        ARJ y archive -jb      converts archive to chapter archive
        ARJ y archive -jb0     converts chapter archive to standard archive

        The "cc" command is an abbreviation for the "y -jb" option.

        ARJ cc archive

        You can restore a specific chapter as in:

        ARJ x archive -jb10    restores chapter 10
        ARJ x archive -jb20    restores chapter 20

        You can restore a range of chapters as in:

        ARJ x archive -jb2-5   extracts chapters 2 to 5
        ARJ x archive -jb2-    extracts chapters 2 to the last chapter

        Please note that when restoring a range of chapters, ARJ will
        segregate each chapter's set of files in a numbered directory based
        upon the chapter number.  Files whose lifespans range over a series
        of chapters will be located in the first of that series.

        This feature is useful for looking over the changes that have
        occurred over a series of chapters.

        You can list a specific chapter or chapter range as in:

        ARJ l archive -jb10    lists chapter 10
        ARJ l archive -jb2-5   lists chapters 2 to 5
        ARJ l archive -jb2-    lists chapters 2 to the last chapter
        ARJ l archive          lists the most recent chapter

        You can see the chapter ranges for each file in the archive with
        the following command:

        ARJ l archive -jb* -jv

        When ARJ tries to modify a chapter archive that already has 250
        chapters in it, ARJ will return a DOS errorlevel of 12.  A batch
        program can take subsequent action by changing the name of the
        chapter archive to a backup name and then re-executing the failed
        ARJ command.

        To start all over again with a chapter archive, you can purge all
        of the previous chapters, convert the archive to a standard
        archive, and then back to an archive chapter.

        Example:  ARJ k archive *.*
                  ARJ y archive -jb0
                  ARJ d archive *.* -hbc       remove chapter labels
                  ARJ cc archive

        You cannot modify specific chapters other than the most recent
        chapter in terms of deleting files.

        You can remove the most recent chapter with one of the following
        commands:

        ARJ d archive *.* -jb
        ARJ dc archive *.*

        If you do not specify the "-jb" with a delete command, the archive
        chapter label will not be deleted.

        You can comment the chapter labels as a way of identifying each
        chapter backup.

        ARJ c archive -hbc -jz         comments the last chapter label
        ARJ c archive "<<*" -jz        comments the last chapter label
        ARJ c archive -hbc -jz -jb*    comments all chapter labels
        ARJ c archive -hbc -jz -jb5    comments the label for chapter 5


     "-jb0" switch

        This switch is also used with the "y" command to convert a standard
        archive to a chapter archive.

        ARJ y archive -jb0     converts chapter archive to standard archive


     "-jb*" switch

        This switch is used to select all chapters.

        When it is used with the LIST command, ARJ displays all chapters.

        ARJ l archive -jb*     displays all chapters

        This switch can be used with the DELETE command to remove all
        chapters of selected file(s).

        ARJ d archive -jb* *.bak *.tmp


     "-jo" switch

        New to this release, the "-jo" option during extraction works along
        with the "-f" and "-u" type options.  In other words, if you want to
        freshen a set of files from an archive, the use of the "-jo" option
        will generate unique names for any files extracted.

        Example:  ARJ x archive *.* -u -jo


     "-js" switch

        The "-js" option by itself is the same as:
        -js.ARJ.ZIP.PAK.ARC.RAR.J.UC2.LZH.ZOO


     "-jt1" switch

        When used during a chapter add, the "-jt1" option will compare only
        the files of the added chapter.  Previous chapters will only be
        CRC tested.

        Example: ARJ ac archive c:\dir\*.* -jt1


     "-jyv" switch

        As a clarification of older documentation, the "-jyv" option will
        disable the next volume prompt EVEN with removable media.  The
        global "-y" option does not disable the next volume prompt with
        removable media.


     end document