Example

 $ SET PASSWORD
 Old password: HONCHO
 New password: BIG_ENCHILADA
 Verification: BIG_ENCHILADA

     In response to the SET PASSWORD command, the system first
     prompts for the old password and then for the new password. The
     system then prompts again for the new password to verify it.
     The password changes if the user is authorized to change this
     account's password, if the old password is given correctly, and
     if the new password is given identically twice; otherwise, an
     error message appears and the password remains unchanged.

     In a real session, neither the old password nor the new
     password and its verification appear on the screen or paper.