The if command in Tcl takes two parameters at the least, space separated. The first is a condition and the second is what's to be performed if the first parameter evaluates to true; it's usually a block in curly braces. Additional groups of three parameters (the word elseif, followed by another condition and a block to perform) may be added to your heart's content, and a final two parameters (the word else, followed by a final block to perform) may also be given.

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More about conditional commands in Tcl

Associated topic - Tcl/Tk - Conditionals and Loops

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