[wodow]

It could accept another signal (e.g. SIGUSR1) and have this clearly documented.

[neilk]

I just added the SIGUSR1 feature to my hacky perl script (see my other comment).

e.g.

    $ (while true; do cat /usr/share/dict/words; done;) | ./randline 3 &
    [2] 93937
    
    $ kill -s SIGUSR1 93937
    declinograph
    brotheler
    woolpack

    $ kill -s SIGUSR1 93937
    lustrify
    brotheler
    bromophenol