global(3tcl)						       Tcl Built-In Commands						      global(3tcl)

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NAME

       global - Access global variables

SYNOPSIS

       global varname ?varname ...?
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DESCRIPTION

       This command has no effect unless executed in the context of a proc body.  If the global command is executed in the context of a proc body,
       it creates local variables linked to the corresponding global variables (though these linked variables, like those created  by  upvar,  are
       not included in the list returned by info locals).

       If  varname  contains  namespace qualifiers, the local variable's name is the unqualified name of the global variable, as determined by the
       namespace tail command.

       varname is always treated as the name of a variable, not an array element.  An error is returned if the name looks like an  array  element,
       such as a(b).

EXAMPLES

       This procedure sets the namespace variable ::a::x
	      proc reset {} {
		  global a::x
		  set x 0
	      }

       This  procedure	accumulates the strings passed to it in a global buffer, separated by newlines.  It is useful for situations when you want
       to build a message piece-by-piece (as if with puts) but send that full message in a single piece (e.g. over a connection opened with socket
       or as part of a counted HTTP response).
	      proc accum {string} {
		  global accumulator
		  append accumulator $string 

	      }

SEE ALSO

       namespace(3tcl), upvar(3tcl), variable(3tcl)

KEYWORDS

       global, namespace, procedure, variable

Tcl																      global(3tcl)