- Cron/Crontab
- Cron
- ManPage
- Crontab-ManPage
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- The clock deamon:
- The cron command starts a process that executes commands
at specified dates and times. Regularly scheduled commands can
be specified according to instructions found in crontab files
in the directory /var/spool/cron/crontabs. Users can submit their
own crontab file using the crontab(1) command. Commands which
are to be executed only once may be submitted using the at(1)
command.
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- The crontab The crontab utility manages a user's access with
cron (see cron(1M)) by copying, creating, listing, and removing
crontab files. If invoked without options, crontab copies the
specified file, or the standard input if no file is specified,
into a directory that holds all users' crontabs.
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- Crontab Entry Format
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- A crontab file consists of lines of six fields each. The
fields are separated by spaces or tabs. The first five are integer
patterns that specify the following:
- minute (0-59),
- hour (0-23 - with 0 = midnight, 23 = 11pm)
- day of the month (1-31),
- month of the year (1-12),
- day of the week (0-6 with 0=Sunday).
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- Example:
- Runs 2 minutes after 0 hour (midnight) every day
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2 0 * * * /www/covalent/ers/servers/vanilla/bin/compress_weblogs.pl |
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- You can specify several minutes by specifying each run time
separated by commas.
- ie: Runs every 10 minutes
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0,10,20,30,40,50 * * * * /www/wio/bin/fmd.pl |
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Crontab Commands |
- To view the Crontab
- If you're logged in as root, this command will display the
system cron.
- > crontab -l
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- To edit the Crontab
- If you're logged in as root, this command will edit the system
cron.
- > crontab -e
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