global man page on Archlinux

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


       global - Access global variables

       global ?varname ...?

       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 ele‐
       ment.  An error is returned if the name looks like  an  array  element,
       such as a(b).

       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

       namespace(n), upvar(n), variable(n)

       global, namespace, procedure, variable

Tcl								     global(n)

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