sed insert line with spaces to a specific line

Question

I have a line with spaces in the start for example \" Hello world\". I want to insert this line to a specific line in a file. for example insert \" hello world\" to the next f

Answer 1

It can be done by splitting the expression like this:

sed -i $file -e '2i\' -e "     $text"

This is a GNU extension for easier scripting.