Answer Posted / jagadeeb choudhury

Cron: is a daemond process its run periodical.Mince you can
run it in every (sec,min,hour,day,date,Month).We can't
remove a cron job we commenting that only.
here 6 fild to schedule a cron job.

At: only run on particular time specifies by user who
schedule that time you can remove a at job.

Ex:-
$at 9:30
>a.txt
>b.txt
[ctl+d]



Thanks,
Jagadeeb@gmail.com

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