extract

#!/bin/bash

if [ $# -lt 1 ];then
  echo "Usage: `basename $0` FILES"
  exit 1
fi

extract () {
    for arg in $@ ; do
        if [ -f $arg ] ; then
            case $arg in
                *.tar.bz2) 
					tar xjf $arg --one-top-level ;;
                *.tar.gz)
					tar xzf $arg --one-top-level ;;
                *.bz2) bunzip2 $arg  ;;
                *.gz)  gunzip $arg       ;;
                *.tar) tar xf $arg --one-top-level ;;
                *.tbz2) tar xjf $arg --one-top-level ;;
                *.tgz) tar xzf $arg --one-top-level ;;
                *.zip)
					a_dir=`expr $arg : '\(.*\).zip'`
					unzip $arg -d $a_dir       ;;
                *.Z)  uncompress $arg   ;;
                *.rar)   
					a_dir=`expr $arg : '\(.*\).rar'` ;
					mkdir $a_dir ;
					rar x $arg  $a_dir      ;;  # 'rar' must to be installed
                *)          echo "'$arg' cannot be extracted via extract()" ;;
            esac
        else
            echo "'$arg' is not a valid file"
        fi
    done
}

extract $@