07-17-2007
Running a Cron Script only @ Startup Pls Help!!
Hi friends i have a script "backup.sh" which is stored in "/var/lib/pgsql" directory.
I want it to run as a cron so that it executes every time the system starts.
I tried the follwing method
I logged in as the root user and typed "crontab -e"
The file was completly blank so i put the following line @ the beggining of the file
"@reboot /var/lib/pgsql/backup.sh"
It said "crontab: installing new crontab"
But the cron did not run when i restarted the system(the script "backup.sh" mails after the task is comleted to an email address)
So i typed "vi crontab" which resides in the "etc"directory the file was something like this:
------------------------------------------------------------------------------------------------------------
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
HOME=/
# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
------------------------------------------------------------------------------------------------------------
I added the follwing line @ the end of the file
"@reboot /var/lib/pgsql/backup.sh"
So it looked like this
------------------------------------------------------------------------------------------------------------
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
HOME=/
# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
@reboot /var/lib/pgsql/backup.sh
------------------------------------------------------------------------------------------------------------
Even this method failed.
Do i have to change the it to "@reboot bash /var/lib/pgsql/backup.sh"
where u have to specify the command to enter "bash" in this case or enter "root" before the script path
Can anybody pls help me in achieving the follwing task I would be very greatful.
Last edited by perk_bud; 07-17-2007 at 06:28 AM..
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO
crontab(1), crontab(5)
AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)