I would like to add a command to be run at startup from within a shell script.

For example, I run the script once and it adds the cron job, so from that time on, each time the OS starts, a specific program is started.

More specific, I'd need xbindkeys to run on startup and this to be done by a one-time running script.

So far I think this line would do the work:

@reboot xbindkeys

(xbindkeys is in PATH)

How could I add this job from a script?