#!/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

% ./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.