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Full Discussion: .z file compression
Top Forums UNIX for Dummies Questions & Answers .z file compression Post 302098060 by Corona688 on Thursday 30th of November 2006 10:33:54 AM
Old 11-30-2006
arunk, did you think I was joking?

Code:
tyler@mecgentoo ~ $ gunzip RolandJV1010.zip
gunzip: RolandJV1010.zip: unknown suffix -- ignored

tyler@mecgentoo ~ $ mv RolandJV1010.zip RolandJV1010.gz
tyler@mecgentoo ~ $ gunzip RolandJV1010.gz

gunzip: RolandJV1010.gz: not in gzip format

tyler@mecgentoo ~ $ unzip RolandJV1010.gz
Archive:  RolandJV1010.gz
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
note:  RolandJV1010.gz may be a plain executable, not an archive
unzip:  cannot find zipfile directory in one of RolandJV1010.gz or
        RolandJV1010.gz.zip, and cannot find RolandJV1010.gz.ZIP, period.

tyler@mecgentoo ~ $ file RolandJV1010.gz
RolandJV1010.gz: InstallShield Z archive Data
tyler@mecgentoo ~ $

This is not a gzip file, not a zip file, and definitely not any archive format that UNIX is equipped to understand.
 

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zipcloak(1)						      General Commands Manual						       zipcloak(1)

NAME
zipcloak - encrypt entries in a zipfile SYNOPSIS
zipcloak [-d] [-b path] [-h] [-v] [-L] zipfile ARGUMENTS
zipfile Zipfile to encrypt entries in OPTIONS
-b path --temp-path path Use the directory given by path for the temporary zip file. -d --decrypt Decrypt encrypted entries (copy if given wrong password). -h --help Show a short help. -L --license Show software license. -O path --output-file zipfile Write output to new archive zipfile, leaving original archive as is. -q --quiet Quiet operation. Suppresses some informational messages. -v --version Show version information. DESCRIPTION
zipcloak encrypts all unencrypted entries in the zipfile. This is the default action. The -d option is used to decrypt encrypted entries in the zipfile. zipcloak uses original zip encryption which is considered weak. Note: The encryption code of this program is not copyrighted and is put in the public domain. It was originally written in Europe and can be freely distributed from any country including the U.S.A. (Previously if this program was imported into the U.S.A, it could not be re-exported from the U.S.A to another country.) See the file README.CR included in the source distribution for more on this. Otherwise, the Info-ZIP license applies. EXAMPLES
To be added. BUGS
Large files (> 2 GB) and large archives not yet supported. Split archives not yet supported. A work around is to convert the split archive to a single-file archive using zip and then use zipcloak on the single-file archive. If needed, the resulting archive can then be split again using zip. SEE ALSO
zip(1), unzip(1) AUTHOR
Info-ZIP v3.0 of 8 May 2008 zipcloak(1)
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