history

-c    clear the history list by deleting all of the entries

      -d offset    delete the history entry at offset OFFSET.
    
      -a    append history lines from this session to the history file
      -n    read all history lines not already read from the history file
      -r    read the history file and append the contents to the history
        list
      -w    write the current history to the history file
        and append them to the history list