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What is the procedure of "at" and crontab" commands?
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Answer Posted / s.rajasekhar
at - executes single time
crontab- executes Multiple time.
at:If you want postpone the excution of process we can use
at command.but you should specify time for running process.
crontab:If you want run some jobs at daily or some times u
can keep those jobs in crontab file.those are cronjobs.
crontab -l:To open crontab file
crontab -e:To edit the crontab file
crontab -r:To remove the crontab file
* * * * * job name
star1:min(1 to 59)
star2:hour(0 to 23)
star3:day of the month(1 to 31)
star4:month(1 to 12)
star5:day of the week(0 to 6)
here zero indicates Sunday
15 05 * * 1-5 job schedule----->This job will run everyday
at 5:15am except Sunday.
Like this so many jobs we can keep in one crontab file.
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