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:
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.
clock command returns the time, formats ...