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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Part I.  Tcl Basics

Chapter 2. Getting Started

This chapter explains how to run Tcl and Tk on different operating system platforms: UNIX, Windows, and Macintosh. Tcl commands discussed are: source, console and info.

This chapter explains how to run Tcl scripts on different computer systems. While you can write Tcl scripts that are portable among UNIX, Windows, and Macintosh, the details about getting started are different for each system. If you are looking for a current version of Tcl/Tk, check the Internet sites listed in the Preface on page lii.

The main Tcl/Tk program is wish. Wish stands for windowing shell, and with it you can create graphical applications that run on all these platforms. The name of the program is a little different on each of the UNIX, Windows, and Macintosh systems. On UNIX it is just wish. On Windows you will find wish.exe, and on the Macintosh the application name is Wish. A version number may also be part of the name, such as wish4.2, wish80.exe, or Wish 8.2. The differences among versions are introduced on page xlviii, and described in more detail in Part VII of the book. This book will use wish to refer to all of these possibilities.

Tk adds Tcl commands that are used to create graphical user interfaces, and Tk is described in Part III. You can run Tcl without Tk if you do not need a graphical interface, such as with the CGI script discussed in Chapter 3. In this case the program is tclsh, tclsh.exe or Tclsh.

When you run wish, it displays an empty window and prompts for a Tcl command with a % prompt. You can enter Tcl commands interactively and experiment with the examples in this book. On Windows and Macintosh, a console window is used to prompt for Tcl commands. On UNIX, your terminal window is used. As described later, you can also set up stand alone Tcl/Tk scripts that are self-contained applications.

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