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 appearance. 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 ALSO
checkbutton(9), choicebutton(9), radiobutton(9)
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