function tv () { i=$(echo ${@} | sed -e's/.*\(...\)$/\1/') ; case $i in bz2) tar tvjf ${@} ;; *gz) tar tvzf ${@} ;; *) tar tvf
${@} ;; esac }

function xv () { i=$(echo ${@} | sed -e's/.*\(...\)$/\1/') ; case $i in bz2) tar xvjf ${@} ;; *gz) tar xvzf ${@} ;; *) tar xvf
${@} ;; esac }