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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Chapter 48.  Tcl 7.4/Tk 4.0

The cget Operation

All widgets support a cget operation that returns the current value of the specified configuration option. The following two commands are equivalent:

lindex [$w config option] 4
$w cget option

Nothing breaks with this change, but you should enjoy this feature.

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