Tcl/Tk in a Nutshell
Paul Raines, Jeff Tranter, Andy Oram · International Linear Collider · 1999
The Tcl language and Tk graphical toolkit are powerful building blocks for custom applications. This quick reference briefly describes every command and option in the core Tcl/Tk distribution, as well as the most popular extensions. Keep it on your desk as you write scripts, and you'll be able to quickly find the particular option you need.