cron-notes.md

OPTIONS

The options are as follows:
-e Edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables.
-l Causes the current crontab to be displayed on standard output.
-r Causes the current crontab to be removed.

EXAMPLES

Command	Description
* * * * 5 who	Will run the who command every minute, of every hour, of every month, for each Friday
5 * * * * who	Will run the who command on the fifth minute, of every hour, of every month, for all days of the week
0 0 * * * who	every day at midnight
*/15 * * * * who	Will run the who command every 15th minute, of every hour, of every month, for all days of the week. The /15 being in place of frequency of Minutes.

CRON SYNTAX

minute hour dayOfMonth month dayOfWeek COMMAND

Part	Range
Minute	0-59
Hour	0-23
Day of Month	1-31
Month	1-12 or Jan-Dec
Day of Week	0-6 or Sun-Sat

FULL EXAMPLE

Type the following items in the command/terminal:

1. Start the crontab tool crontab -e
2. You will be switched to an unusual looking interface, also called the Vi Editor. Press the i key to Insert your cron command.
3. Now type the following: */15 * * * * yourcommand every fifteenth minute of every hour of every day
4. Now press the Esc key.
5. Type :wq exactly and press enter when done. You should see: crontab: installing new crontab