Friday, December 12, 2014

what is the difference between "cron" command and "at" command

Cron can be scheduled with different choices   (minute,hour,month,dayofmonth,dayofweek). cron can be  edited,deleted,listed,scheduled at any time and for  repeated time intervals.

AT can be scheduled for once.cannot be edited, can be deleted, can be listed."at" command is used to schedule the task only once i.e to  run only one time.

so, 2 main differences:-
cron:can be scheduled for repeated jobs
AT: can be scheduled for only once

cron can be edited
AT cannot be edited, after its schedule.

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