http://www.netknowledgebase.com/tutorials/psybnc.html#2
Setting Crontab
The basic form for a crontab entry is (to the best of my knowledge):
<minute> <hour> <day> <week> <month> <process to run>
So, if you like to check every 10min, it would be:
0,10,20,30,40,50 * * * * /path/to/my/process
Included with psybnc is psybncchk. Open this file and change the line that reads PSYBNCPATH=/set/path/here. Set it to your psybnc directory of course. Make sure this file has execute perms; in your shell, type:
chmod 700 psybncchk
Then add the following to your crontab (use crontab -e to edit your crontab): (this example is for a check every 10 minutes:
0,10,20,30,40,50 * * * * /l33t/shell/psybnc/psybncchk >/dev/null 2>&1
The >/dev/null 2>&1 part tells crontab not to send you an e-mail whenever it restarts psybnc. Omit that part if you like e-mail.