Add Linux command to run as sudo

src/linux.md

@@ -270,3 +270,9 @@ scp file-name.ext <user>@<server>:~/path/to/directory/
 # Copy the contents of a folder to a remote folder.
 scp -r .\path\to\directory\* <user>@<server>:/path/to/remove/directory
 ```
+
+## Sudo
+```bash
+# Start a root shell. `exit` when done.
+sudo -s
+```