How to add some text before another with sed in FreeBSD?

Question

How to add some text before another with sed? With GNU sed on linux I can make it like that:

sed -i "/\;Marker/i some text" conffile

It puts "some text" before ";Marker". But in FreeBSD I get an error:

sed: 1: "/conffile ...": extra characters at the end of l command

I need analog to use it in FreeBSD.

Answer 1

found this way:

sed -i'' -e $'/Marker/i\\\nblahblah\\\n' file

or

sed -i'' -e '/Marker/i\'$'\n''blahblah'$'\n' file