How to change username?

To change a username in a Unix-like operating system, you can use the usermod command. Here’s how to do it:

Open the terminal.
Run the following command (replace old_username with the current username and new_username with the desired new username):
```
sudo usermod -l new_username old_username
```
Change the home directory name (if you want to change it as well):
```
sudo usermod -d /home/new_username -m new_username
```
Update any references to the old username in system files or configurations as needed.
Log out and log back in to see the changes take effect.

Note: Changing a username can affect file permissions and ownership, so proceed with caution. Always back up important data before making such changes.

If you need further assistance, feel free to ask!