Creating classic hello world program using GUI in Tcl/Tk can be done in few lines or may be only a line !
Oneliner can do below.
pack [button .b1 -text “Hello World” -command exit -width 50]
This line can be read : pack a button named .b1 with hello world text and exit command when clicked.
Save it to hello_oneline.tcl then run on command prompt : wish hello_oneline.tcl.
Voila!
Click the button and the window will close.
Bye ..