redhat man page for global

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

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NAME
       global - Access global variables

SYNOPSIS
       global varname ?varname ...?
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DESCRIPTION
       This  command  is  ignored  unless a Tcl procedure is being interpreted.  If so then it declares the given varname's to be global variables
       rather than local ones.	Global variables are variables in the global namespace.  For the duration of the current procedure (and only while
       executing in the current procedure), any reference to any of the varnames will refer to the global variable by the same name.

       Please  note that this is done by creating local variables that are linked to the global variables, and therefore that these variables will
       be listed by info locals like all other local variables.

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

KEYWORDS
       global, namespace, procedure, variable

Tcl																	 global(n)