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- From: w8sdz@SimTel.Coast.NET (Keith Petersen)
- Subject: Info on ARC/ARJ/LZH/ZIP/ZOO/LBR/Compressed/Squeezed files (941223)
-
- [File: /SimTel/msdos/starter/00-files.doc Revised: Dec. 23, 1994]
-
- All about ARC, ARJ, LZH, ZIP, ZOO, LBR, Compressed and Squeezed files
-
- Some of the files available from SimTel, the Coast to Coast Software
- Repository (tm), have been transformed by using one of the standard
- freely-distributable utilities that either SQueezes, LiBRaries, ARChives,
- ARJs, LZHs, ZIPs, or ZOOs files. Some files in other collections have
- been compressed.
-
- 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 that signifies
- the transformation. These are:
-
- .arc for files archived with PKPAK.EXE
- .arj for files archived with ARJ.EXE
- .lbr for files libraried with LU.EXE
- .lzh for files archived with LHA.EXE
- .zip for files archived with ZIP.EXE
- .zoo for files archived with ZOO.EXE
- .?q? for squeezed files (middle letter is a Q).
- .gz for files compressed with gzip
- .Z for files compressed with compress
-
-
- 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 /SimTel/msdos/archiver/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 /SimTel/msdos/archiver/arj241a.exe to extract the component
- files. ARJ241A.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 /SimTel/msdos/archiver/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 x file"
- You do not need to supply the LZH file type when specifying "file."
-
-
- ZIP FILES
-
- ZIP 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. ZIP will automatically
- compress member files when adding them to the archive, and UNZIP will
- expand them upon extraction. For files with the .ZIP extension, you
- must have a copy of file /SimTel/msdos/zip/unz512x.exe to extract the
- component files. UNZ512X.EXE is a "self-extracting archive." When you
- run this program, it will produce UNZIP.EXE and its documentation. After
- you end up with a copy of UNZIP you can use it to extract files. An
- example of using UNZIP to unpack an archive "FILE.ZIP" is:
- "A>unzip file"
- You do not need to supply the ZIP file type when specifying "file."
-
- The companion program to create ZIP files is /SimTel/msdos/zip/zip20x.zip.
-
- Also available: /SimTel/msdos/zip/pkz204g.exe - PKWare's fast ZIP and
- UNZIP programs (a self-extracting archive).
-
- 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. The current version of ZOO
- is zoo210.exe, which may be found in the /SimTel/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 /SimTel/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 /SimTel/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.
-
-
- COMPRESSED FILES
-
- COMP430D is used to uncompress, or expand files that have a ".Z" file
- type. Such files have been compressed with a Unix-compatible compress
- program which uses LZW 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 25% to 70% by compressing it. If you download a file with a file type
- indicating that it is compressed, you will need file COMP430D.EXE from
- /SimTel/msdos/compress/comp430d.zip to expand it before you can use it.
- The syntax to uncompress a file would be:
- "A>comp430d -d file.Z"
- where file.Z was the file you wanted to uncompress. You must supply
- the full file name and type.
-
-
- GZIP COMPRESSED FILES
-
- GZIP is used to uncompress, or expand files that have a ".gz" file type.
- Such files have been compressed with a compress program which uses the
- same encoding as ZIP to reduce the size of the target file. Depending
- on the distribution of data in a file it can be reduced in size by 35%
- to 80% by compressing it with GZIP. You will need file GZIP.EXE from
- /SimTel/msdos/compress/gzip124.zip to expand it before you can use it.
- The syntax to uncompress a file would be:
- "A>gzip -d file.gz"
- where file.gz was the file you wanted to uncompress. 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 ARJ241.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 UNZIP/ZIP which is included in
- the UNZ512X.EXE and ZIP20X.ZIP files. For ZOO archives, see the
- documentation included in ZOO210.EXE and UGUIDE.ZIP. 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
- General Manager of SimTel, the Coast to Coast Software Repository (tm)
- Internet: w8sdz@SimTel.Coast.NET or w8sdz@Vela.ACS.Oakland.Edu
- Uucp: uunet!simtel.coast.net!w8sdz BITNET: w8sdz@OAKLAND
-