Tk - Special Variables

In Tk, we classify some of the variables as special variables and they have a predefined usage/functionality. The list of special variables is listed below.

Sr.No.	Special Variable & Description
1	tk_library Used for setting the location of standard Tk libraries.
2	tk_patchLevel Refers to the current patch level of the Tk interpreter.
3	tk_strictMotif When non-zero, Tk tries to adhere to Motif look-and-feel as closely as possible.
4	tk_version Displays the Tk version.

The above special variables have their special meanings for the Tk interpreter.

Examples for using Tk special variables

Lets see the examples for special variables.

TK VERSION

#!/usr/bin/wish

puts $tk_version

When you run the program, you will get a similar output as shown below.

8.5

TK LIBRARY PATH

#!/usr/bin/wish

puts $tk_library

When you run the program, you will get a similar output as shown below.

/Library/Frameworks/Tk.framework/Versions/8.6/Resources/Scripts

TK PATCH LEVEL

#!/usr/bin/wish

puts $tk_patchLevel

When you run the program, you will get a similar output as shown below.

8.6.1

TK STRICTMOTIF

#!/usr/bin/wish

puts $tk_strictMotif

When you run the program, you will get a similar output as shown below.