SCHEDULING

crontab -l                        List out crontab entrys
crontab -e                        Edit crontab entrys
crontab -l > (filename)           Output crontab entrys to a file
crontab (filename)                Enter a crontab from a file
crontab -r                        Removes all crontab entrys
crontab -v                        Displays crontab submission time.

/var/adm/cron/cron.allow        File containing users allowed crontab use.
/var/adm/cron/cron.deny         File containing users denied crontab use.
/var/adm/cron/crontab           Directory containing users crontab entries.
/var/adm/cron/log               Cron log file.

at (now + 2 minutes, 13:05, etc) {return}        Schedule a job using at
Command or schell script {return}
{CTRL D}

echo "shutdown -Fr" | at now + 1 minute

at -l                                
atq                      Lists out jobs scheduled to run via at command

at -r (at job No)
atrm  (at job No)        Removes an at job scheduled to run.

/var/adm/cron/at.allow   File containing users allowed at use.
/var/adm/cron/at.deny    File containing users denied at use.
/var/adm/cron/atjobs     Directory containing users at entries.