Hello World in Tk

    #!/software/tk/bin/wish -f
    wm title . "hi!"
    button .hello -text "Hello, World!" -command exit
    pack .hello

This shell script, when run, presents the interface

• The window manager is told that the titlebar should read ``hi!''.
• A button widget, .hello, is created with the label ``Hello, World!''.
• The geometry manager pack is used to place .hello on the display.
• When all commands have been read, wish enters an event-processing loop.
• When the .hello button is pressed, the program terminates (exit is executed).