Task Scheduling on linux

antivirus · 02-23-2007, 12:06 PM

Hi
Im a new user of linux. I want to know more about corn. Please help me. Every night at 9pm i want to execute "ifup eth1" and every morning at 9am i want to execute "ifdown eth1" command what will i do. Do i have to change SHELL, PATH, HOME's value?

jailbait · 02-23-2007, 12:35 PM

You have to place an entry in /etc/crontab to execute the comand that you want at the time that you want. Here is an explanation on how to do that:

http://www.pantz.org/os/linux/programs/cron.shtml

You also have to create a command and have the crontab line execute that command. I suggest that you give the full path to the command in the crontab entry rather than try to change the PATH used by cron.

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Steve Stites

antivirus · 02-24-2007, 09:52 AM

Thanks for your reply. Got another trouble with permission. Whenever cron tyies to execute my command it gives an error like

"exec permission denied mycommand"

On which file i have to change premission. Have any idea bout this things?

the.madjack · 02-25-2007, 10:25 PM

Quote:

Originally Posted by antivirus

Thanks for your reply. Got another trouble with permission. Whenever cron tyies to execute my command it gives an error like

"exec permission denied mycommand"

On which file i have to change premission. Have any idea bout this things?

did you run the command as root?

Matir · 02-25-2007, 10:36 PM

Yes, ifdown would need to be run as the root user, so must be placed in the root crontab (or run through sudo, though the root crontab probably makes more sense).

jailbait · 02-26-2007, 11:17 AM

"exec permission denied mycommand"

You need to set the permissions for your command to executable. Use the chmod command. For example:

chmod +x /myprogs/mycommand

See:
man chmod

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Steve Stites

antivirus · 02-27-2007, 07:48 AM

Thanks!!!
Again @jailbait. I just changed that file permision as u said and its working...........