Practical Programming in Tcl & Tk, Third Edition By Brent B. Welch
Table of Contents
Preface
The more important examples are set apart with a title and horizontal rules, while others appear in-line. The examples use courier for Tcl and C code. When interesting results are returned by a Tcl command, those are presented below in oblique courier. The => is not part of the return value in the following example.
expr 5 + 8 => 13
The courier font is also used when naming Tcl commands and C procedures within sentences.
The usage of a Tcl command is presented in the following example. The command name and constant keywords appear in courier. Variable values appear in courier oblique. Optional arguments are surrounded with question marks.