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Practical Programming in Tcl and Tk, Fourth Edition by Brent Welch, Ken Jones

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Chapter 13. Reflection and Debugging

This chapter describes commands that give you a view into the interpreter. The history command and a simple debugger are useful during development and debugging. The info command provides a variety of information about the internal state of the Tcl interpreter. The time command measures the time it takes to execute a command. Tcl commands discussed are: clock, info, history, and time.

Reflection provides feedback to a script about the internal state of the interpreter. This is useful in a variety of cases, from testing to see whether a variable exists to dumping the state of the interpreter. The info command provides lots of different information about the interpreter.

The clock command returns the time, formats ...

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