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script to add text in middle of file

I'm looking for a solution to adding text to the middle of the smb.conf file. This is my script so far.

Code:

#!/bin/sh

echo "Enter username"

read NAME

useradd -c "$NAME" -m $NAME

echo $NAME = $NAME >> /etc/samba/smbusers

smbpasswd -a $NAME

What I need it to do now is the user that is created be added to a share as a valid user inside the same script. i.e.

smb.conf file share...

[file]
valid users = blahblah, blahblah2, blahblah3, (Add New User Here)
path = /file
create mask = 0755
browesable = no
read only = no

Thanks in advance.

sed '/valid users/ s/$/, newuser/' smb.conf

#!/bin/sh
echo "Enter username"
read NAME
useradd -c "$NAME" -m $NAME
mkdir /file/$NAME
echo $NAME = $NAME >> /etc/samba/smbusers
smbpasswd -a $NAME
sed '/valid users/ s/$/, $NAME/' /etc/samba/smb.conf

...is the new code.

It makes $NAME a valid user of the new directory made. /file is the root directory, and has its own share, is there an easy fix to making $NAME a valid user of /file which is already made?

Use double-quotes if you want to expand the variable name

Code:

sed -i "/valid users/ s/$/, $NAME/" /etc/samba/smb.conf