I am new to using crontab, and I've been trying to get a simple cron job.
I want press F5 every 1 minute to refresh Mozzila Firefox. I am using xdotool for press F5.
I have script /usr/local/bin/refresh.sh:
xdotool search --name "Mozilla Firefox" key F5
-rwxr-xr-x. 1 root root 89 15. čec 10.32 refresh.sh
*/1 * * * * cd /usr/local/bin && sh refresh.sh
xdotool command is automation tool for X11 which allows you simulate keyboard/mouse input, but since crontab is run independently, it's required to define
DISPLAY variable to specify which X Window System display server to use. Normally when you're login to the desktop this variable is assigned automatically, but crontab is running jobs in isolated environment (doesn't have even a tty associated), especially when you run commands via
So in short, you should do define your job like:
*/1 * * * * DISPLAY=:0 /usr/local/bin/refresh.sh
Or you can define variables at the beginning of the file (in case of Vixie cron). See: Variables in crontab?
Also make sure the user which is running the job has granted access to the selected X display. If you need to grant the access, you need to assign the permission via
setfacl commands and specify extra
XAUTHORITY variable, see: Xdotool using “DISPLAY=:0” for more details.