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Top Forums Shell Programming and Scripting Show Percentage Compression in GZIP Post 302833157 by vinay4889 on Tuesday 16th of July 2013 11:08:19 AM
Old 07-16-2013
Quote:
Originally Posted by Corona688
gzip won't ever make a file that much larger than it started, so it must be meaning the opposite of what you think.
Thanks for quick resonse.
I am confused a bit. My assumption was based upon some pages on Internet. Can you please take a look at below.

Why GZip compression increases the file size for some extension?

Also , if it is really compressed why would it show compresion % more than 100%. I checked for some small files and compression % was 91%.
 

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ZNEW(1) 						      General Commands Manual							   ZNEW(1)

NAME
znew - recompress .Z files to .gz files SYNOPSIS
znew [ -ftv9PK] [ name.Z ... ] DESCRIPTION
Znew recompresses files from .Z (compress) format to .gz (gzip) format. If you want to recompress a file already in gzip format, rename the file to force a .Z extension then apply znew. OPTIONS
-f Force recompression from .Z to .gz format even if a .gz 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 .Z file when it is smaller than the .gz file; implies -t. SEE ALSO
gzip(1), zmore(1), zdiff(1), zgrep(1), zforce(1), gzexe(1), compress(1) BUGS
Znew 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. ZNEW(1)
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