Plugins and Hooks

  [Signals]       SIGTERM     SIGINT     SIGQUIT
                  SIGTTIN     SIGTTOU    SIGWINCH
  [Traps]         DEBUG       ERR        EXIT    X RETURN
  [Words]         PS1       X PS2      X PS3       PS4
  [Completion]    complete
  [Other Plugin]  PROMPT_COMMAND       X command_not_found    
