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global(n)                                   Tcl Built-In Commands                                  global(n)



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NAME
       global - Access global variables

SYNOPSIS
       global varname ?varname ...?
____________________________________________________________________________________________________________


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 \n
              }


SEE ALSO
       namespace(n), upvar(n), variable(n)


KEYWORDS
       global, namespace, procedure, variable



Tcl                                                                                                global(n)