Cron Question for Newbie

hello there,

I've got a couple of questions:

when I do a crontab -e on one of our freebsd boxes it comes up with the following (plus a few more lines, but this is the one I'm interested in):

0 0-23/12 * * * /usr/local/icr/sophos.sh >/dev/null 2>&1

Could someone let me know what frequency this is being run ?

Also, I want to add this line to our other freebsd box but am unsure where to find the file to edit - could you possibly let me know that as well.

Sorry for my ignorance, I'm very new at Unix etc and want to at least make sure our anti-virus software is getting updated each night (sophos.sh).

cheers,

Adam

Why Apache forum?

>> what frequency this is being run ?

Every 12 hours at 0:00 and 12:00. It can also be written as */12.

>> where to find the file to edit

Copy sophos.sh to your other box.

>> getting updated each night

You probably should avoid peak hour/minute.

Thanks for that and sorry for posting in the wrong forum.

With regards to ">> where to find the file to edit " I actually meant the Cron file (is that right ?) I already have the sophos.sh file on both machine. Do you know where I might find it ?

Also, instead of every 12 hours, how would I set it for say midnight each night.


cheers,

Adam

>> I actually meant the Cron file

You don't edit the crontab file by hand, run crontab -e, then edit it from there.

>> how would I set it for say midnight each night

Running it at exact midnight is bad. Anyway:

0 0 * * * /usr/local/icr/sophos.sh >/dev/null 2>&1