Menu Driven Shell Script

Explains how to write a menu driven Shell script, which has following options:
1. Contents of /etc/passwd
2. List of users currently logged
3. Present handling directory (working directory)
4. Exit
Take action as per selected option

#!/bin/bash


# A menu driven Shell script which has following options


# Contents of /etc/passwd


# List of users currently logged


# Prsent handling directory


# Exit


# As per option do the job


# -----------------------------------------------


# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>


# This script is licensed under GNU GPL version 2.0 or above


# -------------------------------------------------------------------------


# This script is part of nixCraft shell script collection (NSSC)


# Visit http://bash.cyberciti.biz/ for more information.


# -------------------------------------------------------------------------


 


while :


do


 clear


 echo "   M A I N - M E N U"


 echo "1. Contents of /etc/passwd"


 echo "2. List of users currently logged"


 echo "3. Prsent handling directory"


 echo "4. Exit"


 echo -n "Please enter option [1 - 4]"


 read opt


 case $opt in


  1) echo "************ Conents of /etc/passwd *************";


     more /etc/passwd;;


  2) echo "*********** List of users currently logged";


     who | more;;


  3) echo "You are in $(pwd) directory";   


     echo "Press [enter] key to continue. . .";


     read enterKey;;


  4) echo "Bye $USER";


     exit 1;;


  *) echo "$opt is an invaild option. Please select option between 1-4 only";


     echo "Press [enter] key to continue. . .";


     read enterKey;;


esac


done