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_libraryUsed for setting the location of standard Tk libraries. |
| 2 | tk_patchLevelRefers to the current patch level of the Tk interpreter. |
| 3 | tk_strictMotifWhen non-zero, Tk tries to adhere to Motif look-and-feel as closely as possible. |
| 4 | tk_versionDisplays 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.
0
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