Tcl is unusual amongst the languages we teach in that it's command based not operator based. This means that each statement starts with a command word which is followed by a number of space separated parameters. Square brackets and curly braces are used to request that part of a command is performed first (as a subcommand), and are deferred for possible later performance respectively.

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More about first principles of Tcl

Associated topic - Tcl/Tk - Tcl Fundamentals

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