Here is a little script that lets me post to pastey.net from a shell prompt

    #!/bin/bash
    set -e

    AUTHOR=bartman
    SUBJECT=pipe
    LANGUAGE=c

    w3m -post <( echo -n -e "language=$LANGUAGE&author=$AUTHOR&subject=$SUBJECT&tabstop=4&text=" ; sed 's/%/%25/g' | sed 's/&/%26/g' ) \
    -dump http://pastey.net/submit.php