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In crontab, I can use an asterisk to mean every value, or "*/2" to mean every even value.
Is there a way to specify every odd value? (Would something like "1+*/2" work?)
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It is a wildcard for every part of the cron schedule expression. So * * * * * means every minute of every hour of every day of every month and every day of the week .
Meaning of cron expression 0 * * * * *? I think it means the scheduler is expected to run every seconds.
You can find them in /var/spool/cron/crontabs. The tables contain the cron jobs for all users, except the root user. The root user can use the crontab for the whole system. In RedHat-based systems, this file is located at /etc/cron.
1 Answer. Show activity on this post. You should try using $HOME rather than ~ as tilde expansion is not reliable in a cron job.
Depending on your version of cron, you should be able to do (for hours, say):
1-23/2 Going by the EXTENSIONS section in the crontab(5) manpage:
Ranges can include "steps", so "1-9/2" is the same as "1,3,5,7,9". For a more portable solution, I suspect you just have to use the simple list:
1,3,5,7,9,11,13,15,17,19,21,23 But it might be easier to wrap your command in a shell script that will immediately exit if it's not called in an odd minute.
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Every odd minute would be:
1-59/2 * * * * Every even minute would be:
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