Cron also accepts lists in the fields. Lists can be in the
form, 1,2,3 (meaning 1 and 2 and 3) or 1-3 (also meaning 1 and 2 and 3).
Example:
59 11 * * 1,2,3,4,5 backup.sh
Will run backup.sh at 11:59 Monday, Tuesday, Wednesday, Thursday and
Friday, as will:
59 11 * * 1-5 backup.sh
Cron also supports 'step' values.
A value of */2 in the dom field would mean the command runs
every two days and likewise, */5 in the hours field would mean
the command runs every 5 hours.
Example:
* 12 10-16/2 * * backup.sh
is the same as:
* 12 10,12,14,16 * * backup.sh
*/15 9-17 * * * connection.test
Will run connection.test every 15 mins between the hours or 9am and 5pm
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