'''info level''' ''?number?''

If ''number'' is not specified, this command returns a number giving the stack level of the invoking procedure, or 0 if the command is invoked at top-level. If ''number'' is specified, then the result is a list consisting of the name and arguments for the procedure call at level ''number'' on the stack. If ''number'' is positive then it selects a particular stack level (1 refers to the top-most active procedure, 2 to the procedure it called, and so on); otherwise it gives a level relative to the current level (0 refers to the current procedure, -1 to its caller, and so on). See the [uplevel] command for more information on what stack levels mean.

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See also:

   * [info]

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''[MGS]'' [[2003/09/09]] - Note that '''info level 0'' does not return values for optional arguments:

 proc foo {bar {baz NULL}} {
   puts "info level 0 = \[[info level 0]\]"
 }
 
   # example1
   foo abc def
   # example2
   foo abc

prints:

 info level 0 = [foo abc def]
 info level 0 = [foo abc]

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