Notes

function group_create_add(){
if [ $(getent group Student) ]
then
echo "**********************************************"
sudo usermod -a -G Student $username
echo "$username HAS BEEN ADDED TO GROUP "STUDENT" SUCCESSFULLY"
echo ""
option
else
echo "**********************************************"
echo "NO SUCH GROUP AS STUDNET......................"
echo "CREATING A GROUP NAMED STUDENT ..............."
echo "PLEASE WAIT .................................."
echo ""
sudo groupadd Student
echo "**********************************************"
echo "GROUP STUDENT CREATED........................."
echo ""
group_create_add $username
fi
}

function check(){
len=`expr length "$username"`
if [[ $len -gt 5 ]]; then
charec=${username:0:2}
username=$charec
check $username
elif [ $len -lt 5 ]; then
num=$(( $RANDOM % 99999999 + 00000000 ))
username=${username}$num
check $username
else
getent passwd $username > /dev/null
if [ $? -eq 0 ]; then
username=$username$username
check $username
else
echo -e " "
password=$(( $RANDOM % 99999999 + 11111111 ))
sudo useradd -m -p $password $username
echo "**********************************************"
echo "USER $username HAS BEEN CREATED SUCCESSFULLY !"
echo "**********************************************"
echo ""
echo "USERNAME : $username"
echo "PASSWORD : $password"
echo "[email protected]"
echo ""
echo "**********************************************"
echo ""
group_create_add $username
fi
fi
option # redirecting to the main menu after the process is completed
}

function new_user(){
echo " Enter User First Name : " #instruction
read firstname # user inputs
echo " Enter User Middle Name : " #instruction
read midname # user inputs
echo " Enter User Last Name : " #instruction
read lastname # user inputs

username=$firstname$lastname
check $username
}


function option(){
echo ""
echo "CHOOSE ANY NUMBER FOR THE RESPECTIVE EVENT" #instruction
echo ""
echo "ENTER 1 FOR ADDING A USER " #instruction
echo "ENTER 2 TO EXIT" #instruction

read choice
if [[ $choice -eq 1 ]]
then
new_user # funciton called for adding a new user
elif [[ $choice -eq 2 ]]; then
exit 1
else
echo "Invalid input" #for error view
option # redirecting to the same function to complete the execution
fi
}


echo "~~WELCOME TO THE PROGRAM FOR MODIFICATION OF USERS AND GROUPS~~" #welcome text
echo ""
option