http://purl.org/tcl/home/man/tcl8.4/TclCmd/info.htm

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What are some common uses of the info command in day to day programming?
   '''`[info cmdcount]`''':   

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In response to a question about finding a way to tell who called a particular proc,
[Bruce Hartweg] wrote on news:comp.lang.tcl (in message 3B157767.A720881E@raytheon.com ):
In [https://groups.google.com/d/msg/comp.lang.tcl/uKX9hWPMECc/SwlSBxTdJF4J%|%How can I tell where a proc was called], [comp.lang.tcl], 2001-05-30, in response to a question about finding a way to tell who called a particular proc, [Bruce Hartweg] wrote (modified):
 # quick tester:
proc who_called {} {
 proc who_called {} {
    puts "I was called from '[lindex [info level -1] 0]' - but first  call was to
 '[lindex [info level 1] 0]'"
 }
proc a {} who_called
 proc a {} {who_called}
 proc b {} {who_called}
 proc c {} {who_called}
 proc d {} {a}
 proc e {n} {$n}
# end
 # end

Output:
 Output:
======none
 % a
 I was called from 'a' - but first call was to 'a'
 % b
 I was called from 'b' - but first call was to 'b'
 % c
 I was called from 'c' - but first call was to 'c'
 % d
 I was called from 'a' - but first call was to 'd'
 % e a
 I was called from 'a' - but first call was to 'e'
 % e b
 I was called from 'b' - but first call was to 'e'
 % e c
 I was called from 'c' - but first call was to 'e'
 % e d
 I was called from 'a' - but first call was to 'e'
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And [Will Taylor] writes:
I find a backtrace useful -- putting these two stmts in the proc in question:
I find a backtrace useful -- putting these two stmts in the
proc in question:
set backtrace ""; getBackTrace backtrace
puts stderr "<the-proc-in-question>: `$backtrace'"
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 proc getBackTrace { backTraceRef } {
  upvar $backTraceRef backTrace
    set startLevel [expr {[info level] - 2}]
  set startLevel [expr {[info level] - 2}]
  for {set level 1} {$level <= $startLevel} {incr level} {
    append backTrace "[lindex [info level $level] 0] => "
  }
 }
Note also that the [Bag of algorithms] makes a couple of mentions of backtracing, and even has other uses of [[info ...]].
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