I have some text 

```
#MATCH1
command 1
command 2
command 3
#MATCH2

sed -i '/MATCH1/,/MATCH2/' s/^/#/' <filename>

```

Does 

```
##MATCH1
#command 1
#command 2
#command 3
##MATCH2

```

And what i want is 

```
#MATCH1
#command 1
#command 2
#command 3
#MATCH2

```

Anyone has any idea how to do this? Without post processing the output 

Thank you