I am trying to get the last day in this current month, or the last month, what I am using to workaround this "problem" is checking with:
if [ $DAY -eq 1 ]; then
code here;
fi
If the day is 1, so it's saying that I am in the new month, so I need to domy backup as well.
Do you guys have any idea how can I do the check if today is the last day in the Month "January 31th" for example???
Thank you!!!!
Getting the last day for a month is sometimes tricky, because not all months have the same days number of course.
One way to do it is to get this month's first day, add a month to that (to get next month's first day) and then subtract a day.
date --date="$(date +%Y-%m-01) +1 month -1 day"
thu jan 31 00:00:00 -07 2019
And remember that date can output whatever format you want (argument starting with +).
date --date="$(date +%Y-%m-01) +1 month -1 day" '+%F'
2019-01-31
See man date for more info or info '(coreutils) date invocation' for even more.
One way would be to use GNU date:
if [[ $(date -d "+1 day" +%m) != $(date +%m) ]]
then
echo "Today is the last day of the month"
else
echo "Today is NOT the last day of the month"
fi
This gives you last day of previous month
date -d "-$(date +%d) days -0 month"
and this gives you last day of current month
date -d "-$(date +%d) days +1 month"
if [[ $(date +%d%m%Y -d "-$(date +%d) days +1 month") != $(date +%d%m%Y) || $(date +%d%m%Y -d "-$(date +%d) days -0 month") != $(date +%d%m%Y) ]]
echo "Today is NOT the last day of the month"
else
echo "Today is the last day of the month"
fi
