How I can get the next month in shell?

Question

I would like to get the current and next months using shell script, I have tried this command:

$ date '+%b'

mar

$ date +"%B %Y" --date="$(date +%Y-%m-15) next month"

March 2018

But it always displays only the current month.

Could you please help me if there is something wrong with the commands.

Answer 1

$ date -d "next month" '+%B %Y'
April 2018

Check this post about specific caveats

Note: your command works just fine for me (archlinux, bash4, date GNU coreutils 8.29)