SV-Administration-Management-Cron

Cron

Cron is used to schedule commands or scripts (groups of commands) automatically at a specified time/date.

Cron Format

01 * * * * root echo "This command is run at one min past every hour"
17 8 * * * root echo "This command is run daily at 8:17 am"
17 20 * * * root echo "This command is run daily at 8:17 pm"
00 4 * * 0 root echo "This command is run at 4 am every Sunday"
* 4 * * Sun root echo "So is this"
42 4 1 * * root echo "This command is run 4:42 am every 1st of the month"
01 * 19 07 * root echo "This command is run hourly on the 19th of July"

minute  This controls what minute of the hour the command will run on,
         and is between '0' and '59'
hour    This controls what hour the command will run on, and is specified in
         the 24 hour clock, values must be between 0 and 23 (0 is midnight)
dom     This is the Day of Month, that you want the command run on, e.g. to
         run a command on the 19th of each month, the dom would be 19.
month   This is the month a specified command will run on, it may be specified
         numerically (0-12), or as the name of the month (e.g. May)
dow     This is the Day of Week that you want a command to be run on, it can
         also be numeric (0-7) or as the name of the day (e.g. sun).
user    This is the user who runs the command.
cmd     This is the command that you want run. This field may contain
         multiple words or spaces.

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