[SDF]

     Instead of the first five fields, one of eight special strings may
     appear:

           string          meaning
           ------          -------
           @reboot         Run once, at startup.
           @yearly         Run once a year, "0 0 1 1 *".
           @annually       (same as @yearly)
           @monthly        Run once a month, "0 0 1 * *".
           @weekly         Run once a week, "0 0 * * 0".
           @daily          Run once a day, "0 0 * * *".
           @midnight       (same as @daily)
           @hourly         Run once an hour, "0 * * * *".

עוד אפשר לראות כאן

ולכן השורה היא:

@reboot /path/to/sc_serv &