hcron is a periodic command scheduler along the lines of the ubiquitous cron–but with unique features. hcron scales easily from a handful of events to many thousands:
At Environment Canada, hcron is in 24/7 operational use with over 300 users, over 3000 event definitions, and more than 130000 events scheduled each day.
Many features are unique to hcron:
# hello_dolly 0 11,21 * 2-12/2 * ssh exechost.abc.xyz 'echo "hello dolly" > /tmp/hello_dolly'; mail -s done Mister.Big@mailhost.abc.xyz
hcron event file (called hello_dolly):
as_user= host=exechost.abc.xyz command=echo "hello dolly" > /tmp/hello_dolly notify_email=Mister.Big@mailhost.abc.xyz notify_message=done when_month=2-12/2 when_day=* when_hour=11,21 when_minute=0 when_dow=2
Using hcron means never needing to check the crontab man page to remember the field order. But there is more to hcron than a key=value approach. See the documentation for more.