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







global - Access global variables








global varname ?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 element. 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