Replace a word with multiple lines using sed?

Question

I\'m working on a bash-script that has to prepare an E-Mail for being sent to a user.

It aggregates some data, which ends up being multiple lines of stuff. For the e

Answer 1

Not sure if you have tried to put "\n" in the replace part

sed 's/[pattern]/\
[line 1]\n\
[line 2]\n\
[line n]\n\
/g' mail.tpl

The first line has /\ for readibility reasons. Each line after that is a stand-alone line like you would find in a text editor. Last line is stand-alone, once again for readability reasons. You can make all of this one line if needed. Works on Debian Jessie when I tested it.