4

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?

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1
  • 3
    If 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 ♦
    Jul 18, 2017 at 11:15

3 Answers 3

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5

Yes, they are identical.

I'd suggest the first syntax as it is more concise.

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3

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'.

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2
  • 2
    Note that mon as a day name is a GNU extension to standard crontab. It's not likely available on non-GNU systems.
    – Andrew Henle
    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
    Jul 18, 2017 at 11:25
0

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.

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