- Lab 2:
  - For this lab you will create an option tree called TRAIN that you will use again for the labs in subsequent modules.
  - What you need to do:
    1. Decide where you want to put your option tree. (Hint: your home directory is a good location. e.g. $HOME/nmopts/nxm/train)
    2. Create the option tree and add it to your path.
       - You may use `OPTION` to create the option tree or do it manually.
       - If you do it manually you will need to make sure not to forget the `mcr` and `prim` sub-directories. You will also need to make sure to copy over the template `commands.cnf` file.
       - Do not try the "symbolic link" approach, since it requires you to have write access to the NeXtMidas installation (i.e. to put symbolic link under `$NMROOT/nxm/` that points to your option tree).
       - Do not try the "back-link" approach, it will cause problems for later labs.
    3. Add the following commands to your option tree (Be sure to use the name provided below):
       1. counter.java (primitive)
       2. sayhello.mm (macro)
    4. Use `UPDATE` to add each of the commands to the dictionary.
       1. `COUNTER` takes in two numbers, `START=` and `END=` which default to 1 and 10 respectively.
       2. `SAYHELLO` takes in a single string `NAME=` which defaults to `"Anonymous"`.
    5. Build your option tree.
    6. Try everything out.

           nM> counter ,, 9
           INFO: Counting from 1 to 9 [COUNTER]
           INFO: Count is at 1 [COUNTER]
           INFO: Count is at 2 [COUNTER]
           INFO: Count is at 3 [COUNTER]
           INFO: Count is at 4 [COUNTER]
           INFO: Count is at 5 [COUNTER]
           INFO: Count is at 6 [COUNTER]
           INFO: Count is at 7 [COUNTER]
           INFO: Count is at 8 [COUNTER]
           INFO: Count is at 9 [COUNTER]
           INFO: Done counting [COUNTER]
           nM>
           nM>
           nM> sayhello Tony
           INFO: Hello TONY! [SAYHELLO]

    7. Tailor your NeXtMidas environment by putting a `nmstartup.mm` macro in your $HOME directory (e.g. /home/student/nmstartup.mm) with the following contents:

           ! customize user's NeXtMidas environment (put this into $HOME/nmstartup.mm)
           startmacro
             say "Running my (^{env.user}'s) custom nmstartup.mm macro..."

             ! portable way to get path to TRAIN option tree under user's home dir ($HOME/nmopts/nxm/train/)
             file name trainDir (^{env.home},nmopts,nxm,train)

             ! define train option tree and add it to the path
             option train trainDir
             path add train
           endmacro

       The next time you run `nmstart`, your $HOME/nmstartup.mm macro gets automatically executed; which will define your TRAIN option and add it to the path.