ed pattern - the first chars in line is unknown

Question

This is how I am adding text before first pattern reveal:

FILE_NAME="folder/myfile.c++"
STR_TO_ADD="string that i want to add"
PATTERN="banana"

ed $FILE_NAME 2>NULL 1>NULL<<EOF
/^$PATTERN
-1
a
$STR_TO_ADD
.
wq
EOF

but if the line is started with some characters before the "banana" so it is not working. mostly white-speces but i whould like to hear answer for all characters. thanks!

Answer 1

This seems to be doing what (I surmise) you want:

#!/bin/bash

FILE_NAME="folder/myfile.c++"
STR_TO_ADD="string that i want to add"
PATTERN="banana"

ed $FILE_NAME <<EOF
/^$PATTERN
-1
a
$STR_TO_ADD
.
wq
EOF