Machine Learns

Open ~/.bashrc file with your favorite editor and paste below script to the bottom of the file.

extract () {
if [ -f $1 ] ; then
    case $1 in
     *.tar.bz2) tar xvjf $1 ;;
     *.tar.gz) tar xvzf $1 ;;
     *.bz2) bunzip2 $1 ;;
     *.rar) rar x $1 ;;
     *.gz) gunzip $1 ;;
     *.tar) tar xvf $1 ;;
     *.tbz2) tar xvjf $1 ;;
     *.tgz) tar xvzf $1 ;;
     *.zip) unzip $1 ;;
     *.Z) uncompress $1 ;;
     *.7z) 7z x $1 ;;
    *) echo "don't know how to extract '$1'..." ;;
   esac
else
   echo "'$1' is not a valid file!"
fi
}

then write "extract" on console with the file you want to extract and see the effect.

extract bla.tar.gz