What is Crontab And what Are Job Roles?

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Cron daemon  is a long running process which executes commands at specific time and day. It’s used to scheduling a task in linux.

We can schedule at one time task with at command and it has atd daemon which is by default installed and enable automatically. We’ve another way to schedule a task with crontab command.

Syntax of at command is at  <timespec>  and after writing the command you can finish it with ctrl+D

To view pending job by atq or at –L

If you want to remove a job use this  atrm <jobnumber>

Scheduling jobs :

Crontab –L          – list the jobs for current user

Crontab –r          – remove all job of current user

Crontab –e         – edit job of current user

Format of crontab :

{min(s)          hour(s)           day(s)             month(s)            weekday(s)        command(s) }

min(s) – > 0-59

hour(s) -> 0-23

day(s) -> 1-31

month(s) -> 1-12

weekday(s) -> 0-6

crontab –v displays the last time you edited your crontab file

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