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Deathwing00
Bodhisattva
Joined: 13 Jun 2003
Posts: 4087
Location: Dresden, Germany
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 Posted: Sun Nov 02, 2003 9:33 pm Post subject: bash programming: cron scheduling |
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FIRST
All right, I would like to program cron so a program runs every 5 minutes in my system like:
| Code: | | echo */5 * * * 6 root /root/scheduled.sh >> /etc/crontab |
But I want it to run from let's say 7 AM to 9 PM...
This means that it'll run every 5 minutes starting at 7 AM and doing it no longer after 9 PM. It should start over again the next day...
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SECOND
Is there a file to only-allow a certain group to be able to schedule using cron? This is because of the need that only system administration group users should be able to use cron to schedule jobs, but the group must be different than root and so. The other groups with their respective users should be able schedule only with at, this is, non-periodical jobs.
TIA |
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Stu_28
Tux's lil' helper
Joined: 12 Jun 2003
Posts: 129
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| Posted: Mon Nov 03, 2003 12:03 am Post subject: |
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If you are using dcron, something like this should suffice:
| Code: |
7-21/5 * * * * /root/scheduled.sh
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Otherwise, if the cron you have doesn't have this ability, you could add this to the beginning of the shell script:
| Code: |
HOUR=`date +"%k"`
if (( $HOUR < 7 )) || (( $HOUR > 20 )) ; then
exit 0
fi
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Of course, this won't run at 21:00, for that you'd have to look at the minutes as well.
Also, there is a cron group and if you aren't in it you can't use cron. However, if you want anything more flexible than that you should look into Access Control Lists. |
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Deathwing00
Bodhisattva
Joined: 13 Jun 2003
Posts: 4087
Location: Dresden, Germany
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| Posted: Mon Nov 03, 2003 10:42 am Post subject: |
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Thanks, that'll do for me...
the cron I use is the most simple one, provided in LFS (Linux From Scratch)
Gotta say LFS is a fake distribution... as there are no packages to be distributed. |
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