Update 101-user-groups.md

add examples

src/data/roadmaps/linux/content/107-user-management/101-user-groups.md

@@ -6,3 +6,107 @@ Learn more from the following resources:
 
 - [@article@How to create, delete, and modify groups in Linux](https://www.redhat.com/sysadmin/linux-groups)
 - [@article@How to manage groups on Linux](https://linuxconfig.org/how-to-manage-groups-on-linux)
+
+# Linux User and Group Management Commands
+
+## Adding a New Group
+To create a new group:
+```bash
+sudo groupadd newgroup
+```
+
+## Deleting a Group
+To remove a group:
+```bash
+sudo groupdel oldgroup
+```
+
+## Modifying a Group
+To change the name of a group:
+```bash
+sudo groupmod -n newgroupname oldgroupname
+```
+
+## Adding a User to a Group
+To add an existing user to a group:
+```bash
+sudo usermod -aG groupname username
+```
+- `-aG`: Appends the user to the group without removing them from other groups.
+
+## Removing a User from a Group
+To remove a user from a specific group:
+```bash
+sudo gpasswd -d username groupname
+```
+
+## Changing a User's Primary Group
+To modify a user's primary group:
+```bash
+sudo usermod -g groupname username
+```
+
+## Creating a New User
+To create a new user:
+```bash
+sudo adduser newuser
+```
+
+## Deleting a User
+To delete a user:
+```bash
+sudo deluser username
+```
+Or using the alternative command:
+```bash
+sudo userdel username
+```
+
+## Deleting a User and Their Home Directory
+To delete a user along with their home directory:
+```bash
+sudo deluser --remove-home username
+```
+Or:
+```bash
+sudo userdel -r username
+```
+
+## Locking a User Account
+To lock a user's account:
+```bash
+sudo usermod -L username
+```
+
+## Unlocking a User Account
+To unlock a user's account:
+```bash
+sudo usermod -U username
+```
+
+## Changing a Group's Password
+To set or change a group password:
+```bash
+sudo gpasswd groupname
+```
+
+## Examples in Action
+### Create a Group and Add a User
+```bash
+sudo groupadd developers
+sudo usermod -aG developers john
+```
+
+### Rename a Group
+```bash
+sudo groupmod -n engineers developers
+```
+
+### Remove a User from a Group
+```bash
+sudo gpasswd -d john engineers
+```
+
+### Delete a Group
+```bash
+sudo groupdel engineers