How do I add a line of text to the middle of a file using bash?

Question

I\'m trying to add a line of text to the middle of a text file in a bash script. Specifically I\'m trying add a nameserver to my /etc/resolv.conf file. As it stands, resol

Answer 1

This might work for you:

 sed -e '/nameserver/{x;/./b;x;h;i\nameserver 127.0.0.1' -e '}' resolv.conf

Or GNU sed:

sed -e '0,/nameserver/{//i\nameserver 127.0.0.1' -e '}' resolv.conf