Use the below command:

It deletes all files and folders contained in the lampp directory.

In case user doesn’t have the permission to delete the folder:

Add sudo at the beginning of the command:

Note: This assumes you are already at the same level in the terminal as the folder you want to delete. If not:

FYI: You can use the following options:

• -f = to ignore non-existent files and never prompt
• -r = to remove directories and their contents recursively
• -v = to display what is being done

Sources

• Ask Ubuntu