For testing the TXSTEP version March 2021 under macOS,
proceed as follows:


1. Installing TUSTEP

- Download the actual version of TUSTEP from the
  tustep homepage www.tustep.uni-tuebingen.de

- install iTerm which is licensed under GPL v2 and
  may be downloaded from www.iterm2.com

- install TUSTEP  by following the instructions
  (a more detailed description you may find - in
  German - at www.tustep.uni-tuebingen.de/inst.html).

- define a TUSTEP session by clicking at TUSTEP in
  the launchpad or double clicking at TUSTEP.app
  in the finder, as described in the installation
  instructions.

  By Clicking on "ok" in the window shown, a further
  window will open with details for the session to
  be defined.

  Under TUSTEP_DSK, you will be asked to enter a
  path name, e.g. ~/projects
  Fill in there the name of the path where TXSTEP
  has been installed.

  Under TUSTEP_PRJ, you will be asked to enter a
  project name. Fill in there "txstep" (without
  quotation marks).

  Under TUSTEP_MEM, give a unique 3-digit number for
  this session (e.g. 148)

  By clicking at "Einrichten", the respective TUSTEP
  sessin will be defined; then click at "Beenden"
  to close the window.


2. Installing and running TXSTEP

- Download TXSTEP from the tustep homepage.

- unzip the file txstep_2103.zip to the directory which you
  specified for TUSTEP_DSK when defining the TUSTEP session
  mentioned above.

- If TUSTEP has been installed in a directory which
  is different from the default directory, then
  some system variables and other values used by TXSTEP
  must be adjusted. For this purpose, start the
  TUSTEP session defined above and give the
  following commands:

   #anmelde, txstep_inst    (and press ENTER)
   #makro, txstep_inst      (and press ENTER)

  This creates the files txstep.bat, log.bat, par_syntax.bat
  and encoding.bat in the directory txstep; in addition,
  the path names used in the script files which contain
  the solutions for the exercises are adjusted.

- Start the Oxygen-Editor: click to "Project" in the
  toolbar and to "Open Project..." and select the file
  txstep/Oxygen_framework/txstep.xpr; a click to
  "Open" will activate the project txstep.

The solutions for the exercises are found in
subdirectory txstep/scripts. When you open
one of these scripts in the oXygen editor, you
may run it by clicking at "txstep" in the External
Tools drop-down menu in the toolbar. Clicking
at "txstep.logfile", the journal file containing
the created TUSTEP commands and messages will be
shown.

If Oxygen is not available, you may run the TXSTEP script
as follows (for "....", give the path name specified for
TUSTEP_DSK, as described above, and replace "xxx.xml"
by the name of the TXSTEP script you want to run):


- in a terminal or iTerm window, change to the directory
  specified for TUSTEP_DSK, and enter

  /txstep/txstep script

  (where for "script" the complete path for the respective
  script must be specified)

  or

- in a TUSTEP session, give the following command:

  #makro
  $$ execute "..../txstep/txstep script"
  *eof

  (where for "script" the complete path for the respective
  script must be specified)