A few verbs (some of which you’re already familiar with) appear chiefly in the imperative, and only rarely in other forms.
- salvē, salvēte, salvētō : hail! [the forms salvēre, salveō, salvētis and salvēbis are also found.]
- avē/havē, avēte, avētō : hail! or farewell! [the form avēre is also found.]
- cedo, cedite/cette : hand it over! tell! (not cēdo… cedo is a second person imperative; cēdo is a first person indicative)
- apage : begone! (cf. Gk. ἄπαγε)
A Lewis and Short search suggests that the latter two (quite reasonably given their Greek roots) are found principally in Roman comedy.
The Essential AG: 206g