Web Hosting Talk : Web Hosting Main Forums : Hosting Security and Technology : SSH Cronjob

[priceww]

I wanna run this command "./adfsas.sh" Every 4 Hours can someone tell me what command I can use via SSH to set this cronjob?

[david510]

You can either use
* */4 * * * full path to the adfsas.sh
OR

* 0,4,8,12,16,20 * * * path to script if you need them to run at a specific time.

[jonwatson]

Command via SSH? Do you mean what to type once your are SSH'd in to the box?

If so:

 crontab -e

Then type in what david510 stated.

[cybersavvy]

you can also edit /var/spool/cron/root to put cron entries

restart crond service /etc/init.d/crond restart (not needed)

[jonwatson]

True, but manually editing the file will not catch errors. Using crontab -e will audit the file before saving and indicate if there have been any errors.

Also, the /var/spool/cron/root file is the root user's cron jobs. The OP didn't indicate whether he had root access to the box or not. Using crontab -e will bring up the crontab for whichever user issues the command.

[sigma]

Also, the "crontab -e" method will work on almost any flavor of Unix, while the crontabs live in various places on various flavors, and require different methods of tickling the cron daemon to notice changes.

Kevin

[priceww]

I runned this command "crontab -e * */4 * * * ./adfsas.sh" and heres the error I got

crontab: invalid option -- d
crontab: usage error: unrecognized option
usage:  crontab [-u user] file
        crontab [-u user] [ -e | -l | -r ]
                (default operation is replace, per 1003.2)
        -e      (edit user's crontab)
        -l      (list user's crontab)
        -r      (delete user's crontab)
        -i      (prompt before deleting user's crontab)

[Patrick]

Run the command separately:

crontab -e

then add:

* */4 * * * /full/path/to/shellscript.sh

[sigma]

And "./adfsas.sh" is not a full path to anything. In fact, that's the one path that's guaranteed not to work. You need something that looks like '/home/myname/script.sh'.

Kevin