#!/bin/bash
# Admin Script for adding / modifying / deleting users
# Script created by Robert Pearce
# Oct 2013

# id -u is used to identify the userid (number) of who
# is currently running this script.
# The value is then compared to 0 (zero), as root UID is 0 zero.
# We know that we need to be root for these types of operation.  It's
# kind of pointless to do anything else unless we identify who
# is running the script

id=`id -u`
if [[ $id -ne 0 ]]; then
        # echoing the fact that some ran this as someone other than root
        echo "This script needs to be run as root"
else
        # just testing to see what happens otherwise
        echo "You are root, or equivaent, so we can continue"
fi

# Clear the screen to clean it up
clear

# Declaring a variable called menu - setting it to yes.  While this is true
# the loop will continue to clear the screen, and draw the menu.

menu=yes
while [ $menu = yes ];
do
clear


# Using echo to display the menu.  \t\t are tabs, and \n is a new line
echo -e "\t\t User Account Admin Menu\n"
echo -e "1.\t Add a New User\n"
echo -e "2.\t Edit a User\n"
echo -e "3.\t Delete an Existing User\n"
echo -e "4.\t Exit the Program\n"
echo -n "Enter Selection: "
        # read is a builtin command capturing the users selection
        # we called the variable "selection"
        read selection

echo $selection

# In this scenario, we can use a case - or menu style logic structure
case $selection in
        1)      #Adding a User
                echo -e "Enter a user name:"
				read name

				echo "Enter a comment:"
				read comment

				echo "Enter a password: (warning not encrypted)"
				read password

				echo "Adding "$name" "$comment""
				useradd -m -c $comment -p $password -s /bin/bash $name

                ;;
        2)      #Edit a User

				echo -e "\t\t User Modifications Admin Menu\n"
				echo -e "1.\t Change user password\n"
				echo -e "2.\t Add user to group\n"
				echo -e "3.\t Set user password to expire\n"
				echo -e "4.\t Exit the Program\n"
				echo -n "Enter Selection: "

				read selection
				echo $selection

				case $selection in
					1)
						echo "Password Change"
						echo "Enter a username"
						read name
						echo "Enter a new password"
						read password
						passwd $name

						;;
					2)
						echo "Add user to group:"
						echo "Enter a username:"
						read name
						echo "Enter a supp group name:"
						read group
						usermod -aG $group $name

						;;
					3)
						echo "Set password expiry:"
						echo "Enter a username:"
						read name
						passwd -e $name

						;;
					4)
						echo "Exiting"
						;;

                ;;
        3)      #Deleting a User
                echo "User Deletion *Warning*"
				echo "Enter a username"
				read name
				echo "Deleting..." $name
				userdel -rf $name
                ;;
        4)      #Exit Program
                echo "Exiting program..."

                menu=no
                ;;
        *)      #Capture all other input (error handling)
                echo "Unrecognized selection"

                exit 1
esac
done