crontab - maintain crontab files for individual users
How to get all list of crontab scheduled users on server
#ls /var/spool/cron/
files :-
/etc/crontab >> is main file
/etc/cron.allow >> who all have access to cronjobs
/etc/cron.deny >> who all doesnt have access to cronjobs
syntax :-
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
* * * * * root touch /tmp/file1
* means every minute/hour/dat of month/month/day of week
*/2 * * * * root touch /tmp/file1 means it will exicute every 2ms of every hour ,every day.
Below lets take example of minute
*/3 >> is every 3ms
3,5 >> at 3ms and 5ms
2-9 >> every 2ms,3ms---9ms.
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