Cron file format

field          allowed values
_____          ______________
minute         0-59
hour           0-23
day of month   1-31
month          1-12 (or names)
day of week    0-7 (0 or 7 is Sun, or use names)

# MIN   HOUR   MDAY  MON  DOW  USER COMMAND
   5     *      *     *    *    root echo 'Hello'

# line for user
# MIN   HOUR   MDAY  MON  DOW   COMMAND
   5     *      *     *    *    echo 'Hello'