For example:
```
[edit interfaces openvpn vtun0]
vyos@vyos# show
(...)
openvpn-option "tls-crypt /config/auth/tls-auth.key"
(...)
[edit interfaces openvpn vtun0]
vyos@vyos# delete openvpn-option [I pressed Tab here] vbash: ${/config/auth/tls-auth.key[@]}: bad substitution
Possible completions:
tls-crypt
/config/auth/tls-auth.key
[edit interfaces openvpn vtun0]
vyos@vyos# delete openvpn-option
```