03-31-2005
Can we edit crontab using a shell script
Hi,
Can some one tell me if we can configure the jobs in crontab using a shell script.
I know it can be done easily by using "crontab -e", but i just want to know whether we can add a job into the crontab using a shell script.
If it can be done, plz suggest the procedure to do it.
If it cannot be done then why(reason)?
thanks
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ATRUN(8) BSD System Manager's Manual ATRUN(8)
NAME
atrun -- run jobs queued for later execution
SYNOPSIS
atrun [-l load_avg] [-d]
DESCRIPTION
atrun runs jobs queued by at(1). Root's crontab(5) must contain the line:
*/10 * * * * root /usr/libexec/atrun
so that atrun(8) gets called every ten minutes.
At every invocation, every job in lowercase queues whose starting time has passed is started. A maximum of one batch job (denoted by upper-
case queues) is started each time atrun is invoked.
OPTIONS
-l load_avg
Specifies a limiting load factor, over which batch jobs should not be run, instead of the compiled-in value of 1.5.
-d Debug; print error messages to standard error instead of using syslog(3).
WARNINGS
For atrun to work, you have to start up a cron(8) daemon.
FILES
/var/at/spool Directory containing output spool files
/var/at/jobs Directory containing job files
SEE ALSO
at(1), crontab(1), syslog(3), crontab(5), cron(8)
AUTHORS
Thomas Koenig <ig25@rz.uni-karlsruhe.de>
BUGS
The functionality of atrun should be merged into cron(8).
BSD
April 12, 1995 BSD