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Full Discussion: compression utilities
Top Forums UNIX for Dummies Questions & Answers compression utilities Post 53193 by LivinFree on Wednesday 7th of July 2004 08:18:10 PM
Old 07-07-2004
In my experience, bzip2 is usually (but not always) better with compression. gzip is my favorite, though. It faster in many cases, and compresses well enough for me.

I do think that zip, gzip, compress, and bzip2 are all different algorithms, though. I know that GNU Zip (gzip) was written specifically because the algorithm in the "compress" program wasn't "free" in the FSF meaning of the word. I was also under the impression that Zip, although it may have been based on the same mathmatics as "compress", was written independently - as was bzip2.

Check the man pages, at least for gzip and bzip2. If I remember correctly, there is some discussion of the algorithm implementation within.
 

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LEARN ABOUT SUSE

bznew

BZNEW(1)						      General Commands Manual							  BZNEW(1)

NAME

       bznew -	 recompress .gz or .tgz files to .bz2 files

SYNOPSIS

       bznew [ -ftv9PK] [ name.gz ...  ]

DESCRIPTION

       Bznew  recompresses  files from .gz (gzip) format to .bz2 (bzip2) format.  If you want to recompress a file already in bzip2 format, rename
       the file to force a .bz2 extension then apply bznew.

OPTIONS

       -f     Force recompression from .gz to .bz2 format even if a .bz2 file already exists.

       -t     Tests the new files before deleting originals.

       -v     Verbose. Display the name and percentage reduction for each file compressed.

       -9     Use the slowest compression method (optimal compression).

       -P     Use pipes for the conversion to reduce disk space usage.

       -K     Keep a .gz file when it is smaller than the .bz2 file

SEE ALSO

       bzip2(1), gzip(1)

BUGS

       Bznew does not maintain the time stamp with the -P option if cpmod(1) is not available and touch(1) does not support the -r option.

																	  BZNEW(1)
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