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TR  4DOS  Batch  Command

TR batch command sets ON or OFF value to environment variable TR.

Normally every batch command starts with "@ECHO  OFF" to suppress batch tracing.  When it is necessary to release tracing, OFF can be changed temporarily to ON, and then back to OFF, after debugging is over.

This process quickly becomes annoying when several linked batch commands are involved in processing.  There is an old technique, to start every batch command with "@ECHO  %TR%", which gives the ability to switch tracing OFF/ON easily by setting an appropriate value to the TR environment variable ("SET  TR=ON" or "SET  TR=OFF").

TR command used with the appropriate parameter can simplify this setting procedure (if parameter is omitted, tracing mode is toggled from the current one).

Demo of TR command operation can be found below the command text.

Note: AUTOEXEC.BAT or AUTOEXEC.NT should contain command "SET TR=OFF"  Tracing is OFF.



:  TR  Switch Batch Command Tracing Mode ON/OFF  01/07/1993-08/27/1999
:  -------------------------------------------------------------------
:  Copyright (C) 1993-1999 by Vladimir Veytsel           www.davar.net

:  1. Tracing mode manipulation parameter:
:     "?" or "/"    - Display TR batch command text
:     "=" or "C"    - Display current tracing mode
:     "0" or "OFF"  - Switch tracing mode OFF
:     "1" or "ON"   - Switch tracing mode ON
:     Other         - Toggle current tracing mode OFF/ON

:     Note:  AUTOEXEC.BAT or AUTOEXEC.NT should contain command
:           "SET TR=OFF"  - Tracing is OFF

@ECHO %TR%

 IF %1.==/. .OR. %1.==?. (LIST %_BATCHNAME ^ GOTO Finish)

 IF "%1"=="=" .OR. %@UPPER[%1].==C. GOTO Finish

 IF %1.==0. .OR. %@UPPER[%1].==OFF. (SET TR=OFF ^ GOTO Finish)
 IF %1.==1. .OR. %@UPPER[%1].==ON.  (SET TR=ON  ^ GOTO Finish)

 IFF %TR%.==OFF. THEN
     SET TR=ON
 ELSE
     SET TR=OFF
 ENDIFF

:Finish

@ECHO %S%%B%Batch command %C%tracing %B%mode is now %C%%TR%%D%
  


Toggle current tracing mode (from OFF to ON).


   Tue  9/28/99 20:32  C:\> TR

   Batch command tracing mode is now ON

Toggle current tracing mode (from ON to OFF).


   Tue  9/28/99 20:33  C:\> TR

   IF %1.==/.  .OR.  %1.==?.  (LIST %_BATCHNAME ^ GOTO Finish)
   IF "%1"=="=" .OR.  %@UPPER[%1].==C.  GOTO Finish
   IF %1.==0.  .OR.  %@UPPER[%1].==OFF.  (SET TR=OFF ^ GOTO Finish)
   IF %1.==1.  .OR.  %@UPPER[%1].==ON.   (SET TR=ON  ^ GOTO Finish)
   IFF %TR%.==OFF.  THEN
   SET TR=OFF
   Batch command tracing mode is now OFF


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