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Unfoo 1.0.6:

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#!/bin/bash

#
# unfoo version 1.0.6
# Copyright 2002, 2005, 2006 Graham Forest <vitaminmoo@wza.us>
# This script is released under the BSD license
# If you make any improvements, or even changes, 
# I'd appreciate it if you'd send 'em to me
# To get the newest version of this script, please
# visit http://obsoleet.org/code
#
#####################################################################

#
# Dependencies:
# tar, gzip, bzip2, unace, unrar, unzip, 7z, but only if you use them
#
#####################################################################

#
# Bugs, TODO:
#
#  o Added beep upon success. Take it out if you don't like it. - Raphael
#
#  o .pkg support is premature! It only works if the .pkg
#    is bzip'd, not with gzip'd .pkg's such as Slackware has. - Raphael
#
#  o Needs to pass options (like -v) to called programs
#
#  o STDIN support
#
#  o Need to add a which statement with decompressor missing error
#
#  o I added some support without actually having
#    it, so some more testing is needed
#
#####################################################################

check_success() # Could've written this by myself. Took it
                # from jsmaby's minimal system's initscript
                # instead. Thanks jsmaby. - Raphael
{
  if [ "$?" == "0" ]; then
    echo -e " done\007" # Makes a beep when successful. - Raphael
  else
    echo -e " failed"
  fi
}

IAM=`basename "$0"` # Our name

if [ ! "$1" ]; then # Seems we've got Altzheimer, hmm?
        echo "$IAM: You must specify at least one file"
        exit 1
fi

for i in "$@"; do

        ITIS=`basename "$i"` # Name of file (for output)

        case "$i" in # Evaluating the filetype...

                # No compression at all
                *.tar)
                        echo -n "$IAM: Unpacking tarball $ITIS..."
                        tar xf "$i"
                        check_success
                        ;;

                # tar'd and gzip'd or compress'd        
                *.tar.gz|*.tgz|.tar.Z|.tar.z)
                        echo -n "$IAM: Decompressing and unpacking gzip'd tarball $ITIS..."
                        gzip -dc "$i" | tar xf -
                        check_success
                        ;;

                # tar'd and bzip2'd     
                *.tar.bz2|*.tbz2|*.pkg)
                        echo -n "$IAM: Decompressing and unpacking bzip'd tarball $ITIS..."
                        bzip2 -dc "$i" | tar xf -
                        check_success
                        ;;

                # gzip'd or compress'd  
                *.gz|*.Z|*.z)
                        echo -n "$IAM: Decompressing gzip archive $ITIS..."
                        gzip -dc "$i" > `basename "$i" .gz`
                        check_success
                        ;;

                # bzip2'd       
                *.bz2)
                        echo -n "Decompressing bzip2 archive $ITIS...";
                        bzip2 -dc "$i" > `basename "$i" .bz2`
                        check_success
                        ;;

                # Packed with (Win)ACE  
                *.ace)
                        echo -n "$IAM: Unpacking WinACE archive $ITIS..."
                        unace x "$i"
                        check_success
                        ;;

                # Packed with (Win)RAR
                *.rar)
                        echo -n "$IAM: Unpacking WinRAR archive $ITIS..."
                        unrar x "$i"
                        check_success
                        ;;

                # Classically zipped    
                *.zip)
                        echo -n "$IAM: Unpacking pkzip archive $ITIS..."
                        unzip "$i"
                        check_success
                        ;;

                # Packed with 7zip, thanks Komoto    
                *.7z)
                        echo -n "$IAM: Unpacking 7zip archive $ITIS..."
                        7z x "$i"
                        check_success
                        ;;

                # Ooops... people have wierd things, eh?        
                *)
                        echo "$IAM: $ITIS - Filetype unknown"
                        ;;

        esac
done