crontab - run immediately?

Question

I have a bunch of cron jobs which run every 30mins.

I'm currently doing some testing, and instead of setting the cron jobs to run every minute, is there a command which I can execute that'll run the cronjobs immediately?

Thanks for your help.

Solution 1

No there isn't.

Of course you can implement a different way, not using crond.

You can wrap your jobs into a script, being normally launched by cron, which you can therefore run by hand whenever you need

Solution 2

I use this which runs scripts in much the same environment as cron:

echo "command" | at NOW

Comments

[max_]

Ok, thanks for your comment. crontab is executed under which user? It would be useful to know so that I can set all the correct file permissions etc. Thank you.

[Sandokas]

there is a user crontab, and a system wide one. Run crontab -e to edit the user's one; edit /etc/crontab to act upon the system wide one.

[William Pursell]

In general, a simple way to determine the environment in which cron is executing your job is to have cron run /usr/bin/env and examine the output. (eg, look for the value of USER)

[user2910702]

Except that at picks up the current environment; also, diff -u /etc/pam.d/{cron,atd} shows a few differences.