Hello, World! in Tk
Our first Tk script is very simple. It creates a button that prints “Hello, World!” to standard output when you press it. Above the button widget is a title bar that is provided by the window manager, which in this case is twm under X windows:
Example 21-1 "Hello, World!" Tk program.
#!/usr/local/bin/wish button .hello -text Hello \ -command {puts stdout "Hello, World!"} pack .hello -padx 20 -pady 10 |
The first line identifies the interpreter for the script:
#!/usr/local/bin/wish
This special line is necessary if the script is in a file that will be used like other UNIX command files. Chapter 2 describes how to set up scripts ...
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