كيف أن يبرمج مهام على [لينوإكس] يستعمل ال `في' أمر

{ 2 comments… read them below or add one }

1 MikeT 05.04.09 at 5:26 am

If you don’t see atd running start it with this command:

# /etc/init.d/atd start

More correctly, if it isn’t running, it probably is not configured to startup when the system is restarted. Which may also keep the above command from working as expected. To correct this, use:

# chkconfig atd --level 234 on
# service atd start

and check again to make sure it is running, if it is, continue with the instructions (which are very good BTW).

2 MikeT 05.04.09 at 5:32 am

I have another followup for you on use of the at command.

I’ve run into situations where I’ve needed a command run every hour BUT I needed the command to run ONLY if the previous run has completed. It might not be hung but it might be very very busy. I don’t mind skipping an hour’s execution if the process is still busy.

When this situation arises, I don’t use cron, I use ‘at’ and the last thing I put in my script is the at command itself to resubmit the job for execution.

Now, even if the job takes three hours, at the top of the following hour, the at command will launch the job as expected without cron jobs bumping into each other.

Yes, there’s ways to put the logic into a script for cron to deal with it but that can also be difficult to maintain and not as obvious (to some) as this approach.

Leave a Comment

Name

E-mail

Website

You can use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Notify me of followup comments via e-mail