'''$argv0''' is a `[global]` variable provided by programs like [tclsh] and [wish] , and contains either the name of the interpreter invoked, or, if a script was provided to the interpreter for exection , the name of the script .



** See Also **

   [argc] :   

   [argv] :   

   [main script] :   determine whether a script is the main script

   [tclsh] :   

   [wish] :   


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