Linux-Automation

Script that automates user managment

Paste this script into your linux terminal:

#!/bin/bash

Exit script if any command fails

set -e

Function to create a user

create_user() { read -p "Enter username: " username read -p "Enter home directory (leave blank for default): " home_dir read -p "Enter shell (leave blank for default): " user_shell read -p "Assign to groups (comma-separated, leave blank for none): " groups

# Construct useradd command
cmd="useradd $username"
[[ -n "$home_dir" ]] && cmd="$cmd -d $home_dir"
[[ -n "$user_shell" ]] && cmd="$cmd -s $user_shell"
[[ -n "$groups" ]] && cmd="$cmd -G $groups"

# Execute command
eval "$cmd"
echo "User $username created successfully."

}

Function to delete a user

delete_user() { read -p "Enter username to delete: " username read -p "Delete home directory as well? (y/n): " delete_home

if [[ "$delete_home" == "y" ]]; then
    userdel -r "$username"
else
    userdel "$username"
fi
echo "User $username deleted successfully."

}

Function to modify a user

modify_user() { read -p "Enter username to modify: " username echo "What would you like to modify?" echo "1. Change home directory" echo "2. Change shell" echo "3. Add to groups" echo "4. Remove from groups" read -p "Choose an option [1-4]: " option

case $option in
    1)
        read -p "Enter new home directory: " new_home
        usermod -d "$new_home" "$username"
        echo "Home directory for $username changed to $new_home."
        ;;
    2)
        read -p "Enter new shell: " new_shell
        usermod -s "$new_shell" "$username"
        echo "Shell for $username changed to $new_shell."
        ;;
    3)
        read -p "Enter groups to add (comma-separated): " add_groups
        usermod -a -G "$add_groups" "$username"
        echo "User $username added to groups: $add_groups."
        ;;
    4)
        read -p "Enter groups to remove (comma-separated): " remove_groups
        for group in $(echo "$remove_groups" | tr ',' ' '); do
            gpasswd -d "$username" "$group"
        done
        echo "User $username removed from groups: $remove_groups."
        ;;
    *)
        echo "Invalid option."
        ;;
esac

}

Function to display user info

display_user_info() { read -p "Enter username to view information: " username if id "$username" >/dev/null 2>&1; then id "$username" grep "^$username:" /etc/passwd else echo "User $username does not exist." fi }

Main menu

while true; do echo "User Management Script" echo "-----------------------" echo "1. Create a new user" echo "2. Delete a user" echo "3. Modify a user" echo "4. Display user information" echo "5. Exit" read -p "Choose an option [1-5]: " choice

case $choice in
    1)
        create_user
        ;;
    2)
        delete_user
        ;;
    3)
        modify_user
        ;;
    4)
        display_user_info
        ;;
    5)
        echo "Exiting script."
        exit 0
        ;;
    *)
        echo "Invalid option. Please try again."
        ;;
esac
echo

done