There is a record:
45 * * * 1 script.sh and
45 0-23 * * 1 script.sh The desired effect is to run the script 45 minutes after every hour on Mondays.
Are they identical? If not, what is the difference?
- 3If you remember that the 2nd field is "hours", the 1st is shorter; if you like seeing a reminder, the 2nd is more obvious.Jeff Schaller– Jeff Schaller ♦2017-07-18 11:15:06 +00:00Commented Jul 18, 2017 at 11:15
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3 Answers
Yes, they are identical.
I'd suggest the first syntax as it is more concise.
They both work. However, I would personally prefer:
45 * * * mon script.sh As it is more readable, and more immediately understandable without having to remember which day of the week is '1'.
- 2Note that
monas a day name is a GNU extension to standardcrontab. It's not likely available on non-GNU systems.Andrew Henle– Andrew Henle2017-07-18 11:13:49 +00:00Commented Jul 18, 2017 at 11:13 - Agreed, but nearly all systems use Vixie/ISC cron (or GNU cron if you prefer). That covers Linux and BSD pretty well.Bob Eager– Bob Eager2017-07-18 11:25:59 +00:00Commented Jul 18, 2017 at 11:25
They are identical but prefered to use first variant, there is less chance to get confused. Generally with its syntax is easy to get confused, here is a some typical mistakes with cron.
