> Hi all, > > Does anyone know what line I neet to print after using the > > crontab -e > > command, in order to run a program every half an hour, at 0 minutes and at > 30 minutes? >
Your line will need to be of the form: 0,30 * * * * /path/to/command That says run at 0 and 30 minutes of every hour, every # day, every month, every day of week. You should use full paths to commands and if your program uses STDERR to print to you may want to redirect it into STDOUT. For STDOUT you will want to make sure the user the cron runs under has mail delivery facilities so that errors/output actually go someplace and don't clog the mail delivery facilities, etc. Also note that cron will usually invoke the command with /bin/sh rather than whatever the default shell of the user is, and may have a restricted or lessened environment. So if you rely on ENV variables, etc. you will need to specifically account for them. Also note that on some systems cron is smarter than others, for instance on Solaris 8 you can't have blank lines in the crontab file, on RH9 you can, their are other eccentricities, so just beware if you run into problems.... man crontab for more including other examples Good luck, http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
