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- File: PD1:<MSDOS.STARTER>00-FILES.DOC Revised March 9, 1992
-
- ALL ABOUT ARCS, ARJS, LZHS, ZIPS, ZOOS, LBRS, and SQUEEZED FILES
-
- Some of the files in the SIMTEL20 MS/PCDOS Software Libraries have
- been transformed by using one or another of the standard public domain
- utilities that either SQueezes, LiBRaries, ARChives, ARJs, LZHs, ZIPs,
- or ZOOs files.
-
- This transformation is performed to compress the files to minimize
- download time, and/or combine several related files into a single
- easily-managed file. You cannot use or run any of these files without
- first transforming them back to their original state.
-
- These processed files are specially named with a file type (the last 3
- letters of a file name after the '.') that signifies the transformation.
- These are:
-
- .ARC for files archived with PKPAK.EXE,
- .ARJ for files archived with ARJ.EXE,
- .LZH for files archived with LHA.EXE,
- .ZIP for files archived with PKZIP.EXE,
- .ZOO for files archived with ZOO.EXE,
- .LBR for files libraried with LU.EXE, and
- .?Q? for squeezed files (middle letter is a Q).
-
-
- ARC FILES
-
- PKPAK is used to create and maintain file archives. An archive is a
- group of files collected together into one file in such a way that the
- individual files may be recovered intact. PKPAK will automatically
- compress member files when adding them to the archive, and PKUNPAK
- will expand them upon extraction. For files with the .ARC extension,
- you must have a copy of file PD1:<MSDOS.ARC-LBR>PK361.EXE to extract
- the component files. PK361.EXE is a "self-extracting archive." When
- you run this program, it will produce PKPAK, PKUNPAK and related
- documentation. After you end up with a copy of PKUNPAK you can use
- it to extract files. An example of using PKUNPAK to unpack an ARChive
- "FILE.ARC" is:
- "A>pkunpak file"
- You do not need to supply the ARC file type when specifying "file."
-
-
- ARJ FILES
-
- ARJ is used to create and maintain file archives. An archive is a
- group of files collected together into one file in such a way that the
- individual files may be recovered intact. ARJ will automatically
- compress member files when adding them to the archive, and will expand
- them upon extraction. For files with the .ARJ extension, you must
- have a copy of file PD1:<MSDOS.ARC-LBR>ARJ230NG.EXE to extract the
- component files. ARJ230NG.EXE is a "self-extracting archive." When
- you run this program, it will produce ARJ and related documentation.
- After you end up with a copy of ARJ you can use it to extract files.
- An example of using ARJ to unpack a ARJ archive "FILE.ARJ" is:
- "A>arj e file"
- You do not need to supply the ARJ file type when specifying "file."
-
-
- LZH FILES
-
- LHA is used to create and maintain file archives. An archive is a
- group of files collected together into one file in such a way that the
- individual files may be recovered intact. LHA will automatically
- compress member files when adding them to the archive, and will expand
- them upon extraction. For files with the .LZH extension, you must
- have a copy of file PD1;<MSDOS.ARC-LBR>LHA213.EXE to extract the
- component files. LHA213.EXE is a "self-extracting archive." When
- you run this program, it will produce LHA and related documentation.
- After you end up with a copy of LHA you can use it to extract files.
- An example of using LHA to unpack an LZH archive "FILE.LZH" is;
- "A>lha e file"
- You do not need to supply the LZH file type when specifying "file."
-
-
- ZIP FILES
-
- PKZIP is used to create and maintain file archives. An archive is a
- group of files collected together into one file in such a way that the
- individual files may be recovered intact. PKZIP will automatically
- compress member files when adding them to the archive, and PKUNZIP
- will expand them upon extraction. For files with the .ZIP extension,
- you must have a copy of file PD1:<MSDOS.ZIP>PKZ110EU.EXE to extract the
- component files. (PKZ110EU.EXE is a "self-extracting archive." When
- you run this program, it will produce PKZIP, PKUNZIP and related
- documentation). After you end up with a copy of PKUNZIP you can use
- it to extract files. An example of using PKUNZIP to unpack an archive
- "FILE.ZIP" is:
- "A>pkunzip file"
- You do not need to supply the ZIP file type when specifying "file."
-
-
- ZOO FILES
-
- ZOO.EXE is an archiving program that is similar to PKPAK and ZIP, but
- it is not compatible with either. ZOO can produce archives with long
- pathnames in them (directory names as well as the file name) and it
- can store comments about each file. If you want to take apart a ZOO
- archive, you will need a copy of ZOO.EXE. Since it is a program in
- development, it's hard to say what its file name will be when you read
- this, but searching for ZOO*.* should turn up the correct file. When
- this article was written the current version of ZOO was ZOO210.EXE,
- which may be found in the PD1:<MSDOS.ZOO> directory. The zoo syntax
- for file extraction is:
- "A>zoo e file"
- You do not need to supply the ZOO file type when specifying "file."
-
-
- LBR FILES
-
- LU and its relatives (LUP, LUU, LUE, LUT, LU86, LAR etc.), maintain
- libraries of files. Most LU-type programs do not perform any
- compression. Because of this, most people will squeeze files before
- adding them to a library if they want to save space. If you want to
- remove the component files from an .LBR file, you should have a copy
- of file PD1:<MSDOS.STARTER>LUE220.COM. This will break up the library
- into its component parts, and optionally unsqueeze any .?Q? files at
- the same time. The syntax for LUE would be:
- "A>lue220 file"
- where file was really FILE.LBR.
-
- LUU.COM can be used to create a .LBR file.
-
-
- SQUEEZED FILES
-
- NUSQ.COM is used to unsqueeze, or expand files that have a "Q" as the
- middle letter of the file type. Such files have been squeezed, or
- compressed with SQPC.COM or something similar. These programs use
- Huffman Encoding to reduce the size of the target file. Depending on
- the distribution of data in a file it can be reduced in size by 5% to
- 60% by squeezing it. If you download a file with a file type
- indicating that it is squeezed, you will need file
- PD1:<MSDOS.STARTER>NUSQ110.COM to expand it before you can use it.
- The syntax to unsqueeze a file would be:
- "A>nusq110 file.tqt"
- where file.tqt was the file you wanted to unsqueeze. You must supply
- the full file name and type.
-
-
- MORE INFORMATION
-
- For more information on ARChives, see the documentation for
- PKPAK/PKUNPAK which is included in the PK361.EXE file. For more
- information on ARJ archives, see the documentation for ARJ which is
- included in the ARJ230NG.EXE file. For more information on LZH
- archives, see the documentation for LHA which is included in the
- LHA213.EXE file. For more information on ZIP archives, see the
- documentation for PKZIP/PKUNZUP which is included in the PKZ110EU.EXE
- file. For ZOO archives, see Rahul Dhesi's excellent documentation
- included in ZOO210.EXE and UGUIDE.ZOO. The doc files included with
- the various LU utilities will explain .LBR's, and LUDEF5.DOC explains
- the layout of these files in detail.
-
-
- Keith Petersen
- Maintainer of the MSDOS, MISC and CP/M archives at SIMTEL20 [192.88.110.20]
- Internet: w8sdz@TACOM-EMH1.Army.Mil or w8sdz@vela.acs.oakland.edu
- Uucp: uunet!umich!vela!w8sdz BITNET: w8sdz@OAKLAND
-