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Crontab

 
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# 1  
Old 06-25-2014
Crontab
Can crontab be removed from an AIX system. We had a script that was running on the system. It stopped working. An outside vendor said that crontab does not exist on the system. and that is why it is not running. How can i verify this and get it back on the systems if needed?

thanks
# 2  
Old 06-25-2014
A crontab generally refers to a file that the cron daemon processes. Each user can have a crontab file. Do an
Code:
ls -l /var/spool/cron/crontabs

to look for various user crontab files.
Make sure the cron daemon is running, do...
Code:
ps -aef | grep cron | grep -v grep

Make sure it is in the /etc/inittab, do
Code:
grep cron /etc/inittab

it should look like this for an AIX system
Code:
cron:23456789:respawn:/usr/sbin/cron

Other useful commands..
Code:
crontab -l   #list current user crontab
crontab -e #edit current user crontab

# 3  
Old 06-25-2014
Thanks for the reply. I ran these commands. from the results below i thing it is running. I did get an error on the last command.

Code:
 hmpprod:/> ls -l /var/spool/cron/crontabs
otal 56
rw-r--r--    1 adm      cron           2020 Jan 16 2009  adm
rw-r--r--    1 esaadmin cron             38 Jan 16 2009  esaadmin
rw-r--r--    1 root     system          140 Nov 23 2011  root
rw-------    1 root     cron           1807 Feb 22 2009  root.001
rw-------    1 root     cron           3265 Jun  2 2011  root.002
rw-r--r--    1 sys      cron            853 Jan 16 2009  sys
rw-r--r--    1 root     cron           1122 Jan 16 2009  uucp
 hmpprod:/> ps -aef | grep cron | grep -v grep
   root  323810       1   0   Jun 02      -  0:02 /usr/sbin/cron
 hmpprod:/> grep cron /etc/inittab
ron:23456789:respawn:/usr/sbin/cron
 hmpprod:/> crontab -l #list current user crontab
at: cannot open /var/spool/cron/crontabs/root
remove private shared memory segments not in use
5 0,6,12,18 * * * /met/sy/vics_cmd/rm_shm
 hmpprod:/>

# 4  
Old 06-25-2014
Looks like the root crontab file is missing, what was the name of the script you had running? You can simply become root and do a crontab -e to recreate it; however, I suggest trying to recover it in the event you have other important tasks in it.
# 5  
Old 06-25-2014
As blackrageous suggested, restore the original file for root, under /var/spool/cron/crontabs.
 
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