monop is reminiscent of the Parker Brother's game
  Monopoly, and monitors a game between 2 to 9 users. It is assumed that the
  rules of Monopoly are known. The game follows the standard rules, with the
  exception that, if a property goes up for auction and there are only two
  solvent players, no auction is held and the property remains unowned.
The game, in effect, lends the player money, so it is possible to
    buy something which you cannot afford. However, as soon as a person goes
    into debt, he must “fix the problem”, i.e., make himself
    solvent, before play can continue. If this is not possible, the player's
    property reverts to his debtee, either a player or the bank. A player can
    resign at any time to any person or the bank, which puts the property back
    on the board, unowned.
Any time that the response to a question is a
    string, e.g., a name, place or person, you can type
    ‘?’ to get a list of valid answers. It
    is not possible to input a negative number, nor is it ever necessary.
A Summary of Commands:
  - quit
- quit game: This allows you to quit the game. It asks you if you're
    sure.
- print
- print board: This prints out the current board. The columns have the
      following meanings (column headings are the same for the
      where,own holdings, andholdingscommands):
      - Name
- The first ten characters of the name of the square.
- Own
- The number of the owner of the property.
- Price
- The cost of the property (if any).
- Mg
- This field has a ‘*’ in it if the property is
        mortgaged.
- #
- If the property is a Utility or Railroad, this is the number of such
          owned by the owner. If the property is land, this is the number of
          houses on it.
- Rent
- Current rent on the property. If it is not owned, there is no
        rent.
 
- where
- where players are: Tells you where all the players are. A
      ‘*’ indicates the current player.
- own
    holdings
- List your own holdings, i.e., money, get-out-of-jail-free cards, and
      property.
- holdings
- holdings list: Look at anyone's holdings. It will ask you whose holdings
      you wish to look at. When you are finished, type
      ‘done’.
- mortgage
- mortgage property: Sets up a list of mortgageable property, and asks which
      you wish to mortgage.
- unmortgage
- unmortgage property: Unmortgage mortgaged property.
- buy
- buy houses: Sets up a list of monopolies on which you can buy houses. If
      there is more than one, it asks you which you want to buy for. It then
      asks you how many for each piece of property, giving the current amount in
      parentheses after the property name. If you build in an unbalanced manner
      (a disparity of more than one house within the same monopoly), it asks you
      to re-input things.
- sell
- sell houses: Sets up a list of monopolies from which you can sell houses.
      It operates in an analogous manner to buy.
- card
- card for jail: Use a get-out-of-jail-free card to get out of jail. If
      you're not in jail, or you don't have one, it tells you so.
- pay
- pay for jail: Pay $50 to get out of jail, from whence you are put on Just
      Visiting. Difficult to do if you're not there.
- trade
- This allows you to trade with another player. It asks you whom you wish to
      trade with, and then asks you what each wishes to give up. You can get a
      summary at the end, and, in all cases, it asks for confirmation of the
      trade before doing it.
- resign
- Resign to another player or the bank. If you resign to the bank, all
      property reverts to its virgin state, and get-out-of-jail-free cards
      revert to the deck.
- save
- save game: Save the current game in a file for later play. You can
      continue play after saving, either by adding the file in which you saved
      the game after the monopcommand, or by using therestorecommand (see below). It will ask you which
      file you wish to save it in, and, if the file exists, confirm that you
      wish to overwrite it.
- restore
- restore game: Read in a previously saved game from a file. It leaves the
      file intact.
- roll
- Roll the dice and move forward to your new location. If you simply hit the
      ⟨RETURN⟩ key instead of a command, it is the same as typing
      roll.
No command can be given an argument instead of a response to a query.