/sys$common/syshlp/helplib.hlb SET, PASSWORD, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ 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.