On 01/09/2021 13:02, Nick Holland wrote:
On 9/1/21 5:50 AM, Joel Carnat wrote:
Hello,
I would like to run a command on "the last day of each month".
From what I understood reading the crontab(5) manpage, the simplest way
would be setting day-of-month to "28-31". But this would mean running
the command 4 times for months that have 31 days.
Is there a simpler/better way to configure crontab(1) to run a command
on "the last day of month" only ?
Thank you,
Joel C.
Just run your script every day, and first thing in the script, check to see
if it is the last day of the month -- and quickly exit if it isn't. Very
cheap to do and relatively easy if you know a good trick to do it.
http://holland-consulting.net/scripts/endofmonth.html
Find the last day of the month:
$ set $(cal)
$ shift $(($# - 1))
$ echo $1
30
Compare to today:
$ date "+%d"
1
rather easy, and fairly portable.
You could probably stuff it into a one-liner in a crontab, but I would not
recommend it.
Nick.
I would go the other way and check tomorrows date. If it is "01", then I
know today is the last of this month:
date --date="tomorrow" +%d
02
--
Thanks and regards
Goetz R Schultz
Quis custodiet ipsos custodes?
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