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- unzip(1) USER COMMANDS unzip(1)
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- NAME
- zipinfo - list detailed information about a ZIP archive file
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- SYNOPSIS
- zipinfo [-1lv] file[.zip] [filespec...]
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- ARGUMENTS
- file[.zip] Path of the ZIP archive. The suffix ``.zip'' is
- applied if the file specified does not exist.
- Note that self-extracting ZIP files are sup-
- ported; just specify the ``.exe'' suffix your-
- self.
-
- [filespec] An optional list of archive members to be pro-
- cessed. Expressions may be used to match multi-
- ple members; be sure to quote expressions that
- contain characters interpreted by the UNIX
- shell. See PATTERN MATCHING (below) for more
- details.
-
- OPTIONS
- -1 list filenames only, one per line (useful for pipes)
- -l list files in Unix "ls -l" format: default
- -v list files in verbose, multi-page format
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- DESCRIPTION
- ZipInfo lists technical information about a ZIP archive,
- including information file access permissions, encryption
- status, type of compression, version and operating system of
- compressing program, and the like. The default option is to
- list files in the following format:
-
- -rw-rwl--- 1.5 unx 2802 t- 538 defX 11-Aug-91 13:48 perms.2660
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- The last three fields are clearly the modification date and
- time of the file, and its name. The case of the filename is
- respected; thus files which come from MS-DOS are always cap-
- italized. If the file was zipped with a stored directory
- name, that is also displayed as part of the filename.
-
- The second and third fields indicate that the file was
- zipped under Unix with version 1.5 of zip (not available, so
- don't ask--this is just an example). Since it comes from
- Unix, the file permissions at the beginning of the line are
- printed in Unix format. The uncompressed file-size (2802 in
- this example) is the fourth field, and the compressed file-
- size is the sixth (538).
-
- The fifth field consists of two characters, either of which
- may take on several values. The first character may be
- either `t' or `b', indicating that zip believes the file to
- be text or binary, respectively; but if the file is
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- ZipInfo version 0.96 1
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- unzip(1) USER COMMANDS unzip(1)
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- encrypted, ZipInfo notes this fact by capitalizing the char-
- acter (`T' or `B'). The second character may also take on
- four values, depending on whether there is an extended local
- header and/or an ``extra field'' associated with the file
- (explained in PKWare's APPNOTE.TXT). If neither exists, the
- character will be a hyphen (`-'); if there is an extended
- local header but no extra field, `l'; if the reverse, `x';
- and if both exist, `X'. Thus the file in this example is
- (apparently) a text file, is not encrypted, and has neither
- an extra field nor an extended local header associated with
- it. The example below, on the other hand, is an encrypted
- binary file with an extra field:
-
- RWD,R,R 0.9 vms 168 Bx 165 shrk 9-Aug-91 19:15 perms.0644
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- Extra fields are used by PKWare for authenticity verifica-
- tion (?) and possibly other purposes, and by an upcoming
- release of Info-ZIP's zip for VMS (to store file attri-
- butes). This example presumably falls into the latter
- class, then. Note that the file attributes are listed in
- VMS format. Other possibilities for the host operating sys-
- tem are OS/2 with High Performance File System (HPFS), and
- DOS or OS/2 with File Allocation Table (FAT) file system,
- denoted as follows:
-
- arc,hid,rdo,sys dos 4096 b- 2334 i4:2 14-Jul-91 12:58 EA DATA. SF
- arc,,rw, 1.0 os2 5358 Tl 1914 i4:3 4-Dec-91 11:33 longfilename.hpfs
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- File attributes in both of these cases are indicated in a
- DOS-like format, where the file may or may not have its
- archive bit set; may be hidden or not; may be read-write or
- read-only; and may be a system file or not. If the attri-
- butes are too long, the version number of the encoding
- software is omitted. (The information is still available in
- the verbose listing, however.)
-
- Finally, the seventh field indicates the compression method
- and possible sub-method used. There are six methods known
- at present: storing (no compression), reducing, shrinking,
- imploding, tokenizing, and deflating. In addition, there
- are four levels of reducing (1 through 4); four types of
- imploding (4K or 8K sliding dictionary, and 2 or 3 Shannon-
- Fano trees); and three levels of deflating (fast, normal,
- maximum compression). ZipInfo represents these methods and
- their sub-methods as follows: ``stor''; ``re:1,'' ``re:2,''
- etc.; ``shrk''; ``i4:2,'' ``i8:3,'' etc.; ``tokn''; and
- ``defF,'' ``defN,'' and ``defX.''
-
- The verbose listing is self-explanatory. It also lists file
- comments and the zipfile comment, if any.
-
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- ZipInfo version 0.96 2
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- unzip(1) USER COMMANDS unzip(1)
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-
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- PATTERN MATCHING
- All archive members are listed unless a filespec is provided
- to specify a subset of the archive members. The filespec is
- similar to an egrep expression, and may contain:
-
- * matches a sequence of 0 or more characters
- ? matches exactly 1 character
- \nnn matches the character having octal code nnn
- [...] matches any single character found inside the brack-
- ets; ranges are specified by a beginning character,
- a hyphen, and an ending character. If a '!' follows
- the left bracket, then the range of characters
- matched is complemented with respect to the ASCII
- character set.
-
- TIPS
- The author finds it convenient to set up an alias ``ii'' for
- ZipInfo on systems which allow aliases, or else to set up a
- batch file ``ii.bat'' or to rename the executable to
- ``ii.exe'' on systems such as MS-DOS which have no provision
- for aliases. The ``ii'' usage parallels the common ``ll''
- alias for long listings in Unix, and the similarity between
- the outputs of the two commands was intentional.
-
- AUTHOR
- Greg Roelofs (also known as Cave Newt). ZipInfo is partly
- based on S. H. Smith's unzip and contains pattern-matching
- code from Thom Henderson, but mostly it was written from
- scratch.
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- ZipInfo version 0.96 3
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