#!/bin/bash

# Given a filename, a regex pattern to match and a string:
# If found, no change, else append space + string to last line --
# this is used for the single-line /boot/cmdline.txt file.

grep $2 $1 >/dev/null
if [ $? -ne 0 ]; then
	# Not found; insert in file before EOF
	sed -i "s/\'/ $3/g" $1 >/dev/null
fi