Bash 101 Help Please

I am trying to append a variable from an adduser script to a line in a
config file (for samba).

Can someone assist me here?

The function is in BOLD below: *createNewSambaAllow()*
*
*
It's not working to put the new line in the smb.conf file?

Cry! Beg! Plead!


Note: This is a assuming I already have a user named "unique" in my
smb.conf line.

#####################################start
script#######################################3
#!/bin/bash

# Add shell and samba user.

_now=$(date +"%m_%d_%Y")
basedir=/home
usershell=/bin/bash

## Declare all the functions first

## function to check if user already exists on system
ifUserExits(){
        grep $1 /etc/passwd > /dev/null
        [ $? -eq 0 ] && return $TRUE || return $FALSE
}

## function to create the user with default shell and home directory passed
from below
createNewUser(){
        if /usr/sbin/useradd "$@"
        then echo "User $6 Added"
        fi
}

## function to set the user password
createPassword(){
        if echo -e "$1\n$1\n" | echo $1:$2 |chpasswd
        then echo "Password Created for User $2"
        fi
}

## function to setup samba user
createNewSambaUser(){
        if (echo $1; echo $1) | /usr/bin/smbpasswd -as $2
        then echo "Samba Account for User $2 Added"
        fi
}

*#####This is the part I have issues with:*
*
*
*## function to add user to the Samba config and restart daemon*
*createNewSambaAllow(){*
*        # Copy to backup the config:*
*         cp /etc/samba/smb.conf /etc/samba/smb.conf-$_now*
*        # stuff the line we need to append to into a variable called
$oldline*
*        # this is supposed to look like this "valid users = unique thing1
thing2 thing3 alice"*
*        oldline = grep unique /etc/samba/smb.conf*
*        # delete the old line in the smb.conf*
*        sed '/unique/d' /etc/samba/smb.conf >>/etc/samba/smb.conf*
*        # dump the old line and the new user into the bottom of smb.conf*
*        echo $oldline && echo $username  >> /etc/samba/smb.conf*
*        # restart samba*
*      /etc/init.d/samba restart*
*        echo "Samba Config Added and Daemon restarted"*
*}*

### This is just for your info #####

## make sure root is running script
if [ $(id -u) -ne 0 ]
then
    echo "You must be root or use sudo to run this script!"
    exit 2
fi

## get username from input
read -p "Enter username : " username

## if user doesn't exist, add user
if ( ! ifUserExits $username )

then
        ## get password from input
        read -p "Enter password : " password
        createNewUser -m -b $basedir -s $usershell $username
        createPassword $password $username
        createNewSambaUser $password $username
        createNewSambaAllow $username
else
       ## oops, username already being used
        echo "Username \"$username\" already exists"
       exit 3
fi

# End Bash Example
--

Anyone?


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