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Full Discussion: Help with gunzip
Top Forums Shell Programming and Scripting Help with gunzip Post 302427254 by drl on Friday 4th of June 2010 10:41:18 AM
Old 06-04-2010
Hi.

If you are comfortable downloading programs, p7zip may be of interest to you. In almost all *nix systems you can have local programs -- in your HOME directory structure -- you do not need to install them in system areas.

Here's an example of creation of a zip file and extraction with p7zip (for me, p7zip was in my Debian repository):
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate uncompress, extract of zip archive with p7zip.
# 7zip: http://p7zip.sourceforge.net/

pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }

rm -f t1 t2 t1.zip
FILE=${1-data1}

pl " Data file $FILE:"
head -20 $FILE

pl " Created zip file:"
cp $FILE t1
zip t1.zip t1
file t1.zip
ls -lgG t1 t1.zip

pl " Unzip with 7z:"
7z e -so t1.zip > t2
ls -lgG t2

pl " Compare files:"
if cmp --quiet t1 t2
then
  pe " Files have identical content."
else
  pe " Files differ, details:"
  diff t1 t2
fi

exit 0

producing:
Code:
% ./s1

-----
 Data file data1:
Albuquerque, N.M.
Arlington, Texas
Atlanta, Ga.
Austin, Tex.
Baltimore, Md.
Boston, Mass.
Charlotte, N.C.
Chicago, Ill.
Cleveland, Ohio
Colorado Springs, Colo.

-----
 Created zip file:
  adding: t1 (deflated 21%)
t1.zip: Zip archive data, at least v2.0 to extract
-rw-r--r-- 1 160 Jun  4 09:37 t1
-rw-r--r-- 1 262 Jun  4 09:37 t1.zip

-----
 Unzip with 7z:

7-Zip  4.58 beta  Copyright (c) 1999-2008 Igor Pavlov  2008-05-05
p7zip Version 4.58 (locale=C,Utf16=off,HugeFiles=on,1 CPU)

Processing archive: t1.zip

Extracting  t1

Everything is Ok

Size:       160
Compressed: 262
-rw-r--r-- 1 160 Jun  4 09:37 t2

-----
 Compare files:
 Files have identical content.

See the sourceforge URL noted in the script. Best wishes ... cheers, drl
 

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LEARN ABOUT OPENSOLARIS

p7zip

p7zip(1)						      General Commands Manual							  p7zip(1)

NAME

       p7zip - Wrapper on 7za, a 7-zip file archiver with high compression ratio

SYNOPSIS

       p7zip [-d] [-h|--help] [--] [file...]
	   -h print this help
	   -d decompress file
	   -- treats  all  subsequent  arguments  as  file names, even if they start with a dash

DESCRIPTION

       7-Zip  is  a  file  archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), ZIP,
       CAB, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format.

       p7zip is a gzip-like CLI wrapper script for 7zip

FUNCTION LETTERS

       -d     Decompress file

       -h, --help
	      Print usage

       --     Treats  all  subsequent  arguments  as  file names, even if they start with a dash

SEE ALSO

       7z(1), 7za(1), 7zr(1), bzip2(1), gzip(1), zip(1)

AUTHOR

       Written for Debian by Mohammed Adnene Trojette.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWp7zip       |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for p7zip is available on http://opensolaris.org.

Mohammed Adnene Trojette					  October 31 2004							  p7zip(1)
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