Notes

#!/bin/bash

function addinguser(){
read -p "Enter username - " addUN
if [[ $addUN =~ ^[A-Z|0-9|a-z]+$ ]]; then
sudo useradd $addUN
echo -e "User added."

else
"Invalid input"

fi
user_list
}
function addinggroup(){
read -p "Enter group name - " addGRP
if [[ $addGRP =~ ^[A-Z|0-9|a-z] ]]; then
sudo groupadd $addGRP
echo -e "group added."
else
echo -e "Invalid input."

fi
user_list
}
function editinguser(){
read -p "Enter username - " editUN
if [[ $(grep $editUN /etc/group |wc -l) -eq 1 ]]; then
read -p "Enter new username - " newUN
sudo usermod -l $newUN $editUN
echo -e "user edited."

else
echo -e "Invalid input."

fi
user_list
}
function editinggroup(){
read -p "Enter groupname - " editGN
if [[ $(grep $editGN /etc/group |wc -l) -eq 1 ]]; then
echo -e "Enter new username - "
read newGN
sudo groupmod -n $newGN $editGN
echo -e "group edited."

else
echo -e "Invalid input."

fi
user_list
}

function deletinguser(){
read -p "Enter username - " delUN
# if [[ $(grep $delUN /etc/group |wc -l) -eq 1 ]]; then
sudo userdel $delUN
echo -e "user deleted"
# else
# echo -e "there is no such user."

# fi
user_list
}
function deletinggroup(){
read -p "Enter groupname - " delGN
# if [[ $(grep $delGN /etc/group |wc -l) -eq 1 ]]; then
sudo groupdel $delGN
echo -e "group deleted"
user_list
}
function user_list(){
echo -e "1. Add User "
echo -e "2. Add group "
echo -e "3. Edit user "
echo -e "4. Edit group "
echo -e "5. delete user "
echo -e "6. delete group "
read -p "Enter any option from [1-6]: " listOption
if [[ $listOption =~ ^[1-6]+$ ]]; then
case $listOption in
1) addinguser ;;
2) addinggroup ;;
3) editinguser ;;
4) editinggroup ;;
5) deletinguser ;;
6) deletinggroup ;;
esac
fi
}
user_list