Answer / kiranraj

export EDITOR=vi ;to specify a editor to open crontab file.

crontab -e Edit your crontab file, or create one if it
doesn't already exist.
crontab -l Display your crontab file.
crontab -r Remove your crontab file.
crontab -v Display the last time you edited your
crontab file. (This option is only available on a few
systems.)

Crontab syntax :-
A crontab file has five fields for specifying day , date
and time followed by the command to be run at that
interval.

* * * * * command to be executed
- - - - -
| | | | |
| | | | +----- day of week (0 - 6)(Sunday=0)
| | | +------- month (1 - 12)
| | +--------- day of month (1 - 31)
| +----------- hour (0 - 23)
+------------- min (0 - 59)

Answer / phani

the crontab fields are

minutes, hours, day of the month, month of the year, day of
the week.

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