1 #!/usr/local/bin/wish -f
 
   2 # Simple Tk script to create a button that prints "Hello, world".
 
   3 # Click on the button to terminate the program.
 
   5 # The first line below creates the button, and the second line
 
   6 # arranges for packer to manage the button's geometry, centering
 
   7 # it in the application's main window.
 
   9 button .hello -text "Hello, world" -command {
 
  10     puts stdout "Hello, world"; destroy .
 
  12 pack append . .hello {top}