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Tcl Basics - Columbia University

1 PARTI. Tcl Basics ITcl BasicsPart I introduces the Basics of Tcl. Everyone should read Chapter 1, whichdescribes the fundamental properties of the language. Tcl is really quite simple,so beginners can pick it up quickly. The experienced programmer should reviewChapter 1 to eliminate any misconceptions that come from using other 2 is a short introduction to running Tcl and Tk on UNIX, Windows,and Macintosh systems. You may want to look at this chapter first so you can tryout the examples as you read Chapter 3 presents a sample application, a CGI script, that implements aguestbook for a Web site. The example uses several facilities that are describedin detail in later chapters. The goal is to provide a working example that illus-trates the power of rest of Part I covers basic programming with Tcl.

The set command is used to assign a value to a variable. It takes two arguments: ... The implementation of is careful to preserve accurate numeric values and avoid conversions between numbers and strings. However, you can make ... The value of variable escape is the ASCII ESC character, which has charac-

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  Value, Ascii, Character, Numeric, Numeric values

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