'''$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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