How can I get last day in the month Shell Scripting [duplicate]

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