VARIABLE(9)VARIABLE(9)NAME
variable - interrogate a button variable
SYNOPSIS
variable var ?value?
DESCRIPTION
Variable queries or sets the value of a Tk radiobutton, checkbutton or
choicebutton variable. An error diagnostic will be returned if the
variable is of the wrong type (if for instance it is the name of a
named channel).
If value is given, the value of the variable is set to that value, and
any associated buttons will subsequently reflect this in their appearā
ance. Omitting the value argument returns the current value of the
variable.
The special variable lasterror holds the text of the last Tk error
encountered. It resets when queried.
SEE ALSOcheckbutton(9), choicebutton(9), radiobutton(9)VARIABLE(9)