Useful-commands.md

@@ -16,7 +16,7 @@ journalctl -eu systemd-nspawn@xcache [--since ...]
 
 get a shell as xrootd user in a new temporary container using the xcache image
 ```bash
-systemd-nspawn --register=no -D /var/lib/machines/xcache /bin/bash
+systemd-nspawn --register=no -M xcache /bin/bash
 ```
 
 `/bin/bash` can also be replaced by an arbitrary command to be run. Pass `-u root` to get a root shell inside the container.