bltdebug

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bltdebug − print Tcl commands before execution bltdebug ?level?
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The bltdebug command is a simple tracing facility for Tcl
commands.  Each command line is printed before it is executed on
standard error.  The output consists of the command line both
before and after substitutions have occurred.  Level indicates at
what level to stop tracing commands.  If level is 0, no tracing
is performed. This is the default.  If no level argument is
given, the current level is printed.  debug