Tcl7.6 User Commands Man Page -- set (n)
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set - Read and write variables


set varName ?value?


Returns the value of variable varName. If value is specified, then set the value of varName to value, creating a new variable if one doesn't already exist, and return its value. If varName contains an open parenthesis and ends with a close parenthesis, then it refers to an array element: the characters before the first open parenthesis are the name of the array, and the characters between the parentheses are the index within the array. Otherwise varName refers to a scalar variable. If no procedure is active, then varName refers to a global variable. If a procedure is active, then varName refers to a parameter or local variable of the procedure unless the global command has been invoked to declare varName to be global.


read, write, variable

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