How do I insert a newline/linebreak after a line using sed

Question

It took me a while to figure out how to do this, so posting in case anyone else is looking for the same.

Answer 1

sed '/pattern/a\\r' file name 

It will add a return after the pattern while g will replace the pattern with a blank line.

If a new line (blank) has to be added at end of the file use this:

sed '$a\\r' file name