As I wrote, the cronjob is probably in either the /etc/crontab file, which you can edit directly, in one of the files in /etc/crontab.d (if it exists) which you can edit directly, or in one of the files in /var/spool/cron, which you can't edit directly, but for which you have to use the crontab edit command.
You can use any editor you want, including nano, if you know how to use it.
I'm not sure which editor the crontab edit command uses by default because I've changed mine to use the one I want.
You can execute the crontab command to edit a crontab (from any directory):
Code:
# export VISUAL=editorname
crontab -u username -e
where editorname is the name of the editor you want to use, and username is the name of the user owning the crontab you want to edit.
You can read the cronjobs in /var/spool/cron to find where the problem cronjob may exist, but editing that file directly will NOT affect scheduled cronjobs.
Note that after editing any file directly yourself you must restart the cron daemon.
If you're not familiar with this and/or if you don't feel comfortable doing it, then you shouldn't attempt it yourself; many cronjobs are critical to the operation of your system, and you can easily break cron.
Jeff