59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
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'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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.TH global n "" Tcl "Tcl Built-In Commands"
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.so man.macros
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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global \- Access global variables
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.SH SYNOPSIS
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\fBglobal \fR?\fIvarname ...\fR?
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.BE
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.SH DESCRIPTION
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.PP
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This command has no effect unless executed in the context of a proc body.
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If the \fBglobal\fR command is executed in the context of a proc body, it
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creates local variables linked to the corresponding global variables (though
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these linked variables, like those created by \fBupvar\fR, are not included
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in the list returned by \fBinfo locals\fR).
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.PP
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If \fIvarname\fR contains namespace qualifiers, the local variable's name is
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the unqualified name of the global variable, as determined by the
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\fBnamespace tail\fR command.
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.PP
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\fIvarname\fR is always treated as the name of a variable, not an
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array element. An error is returned if the name looks like an array element,
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such as \fBa(b)\fR.
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.SH EXAMPLES
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.PP
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This procedure sets the namespace variable \fI::a::x\fR
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.PP
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.CS
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proc reset {} {
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\fBglobal\fR a::x
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set x 0
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}
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.CE
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.PP
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This procedure accumulates the strings passed to it in a global
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buffer, separated by newlines. It is useful for situations when you
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want to build a message piece-by-piece (as if with \fBputs\fR) but
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send that full message in a single piece (e.g. over a connection
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opened with \fBsocket\fR or as part of a counted HTTP response).
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.PP
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.CS
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proc accum {string} {
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\fBglobal\fR accumulator
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append accumulator $string \en
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}
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.CE
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.SH "SEE ALSO"
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namespace(n), upvar(n), variable(n)
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.SH KEYWORDS
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global, namespace, procedure, variable
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