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'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
'\" RCS: @(#) $Id: proc.n,v 1.5 2004/10/27 14:24:37 dkf Exp $
'\" RCS: @(#) $Id: proc.n,v 1.5.12.1 2007/11/01 16:25:50 dgp Exp $
'\"
.so man.macros
.TH proc n "" Tcl "Tcl Built-In Commands"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
proc \- Create a Tcl procedure
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When \fIname\fR is invoked a local variable
will be created for each of the formal arguments to the procedure; its
value will be the value of corresponding argument in the invoking command
or the argument's default value.
Arguments with default values need not be
specified in a procedure invocation. However, there must be enough
actual arguments for all the
formal arguments that don't have defaults, and there must not be any extra
formal arguments that do not have defaults, and there must not be any extra
actual arguments. There is one special case to permit procedures with
variable numbers of arguments. If the last formal argument has the name
\fBargs\fR, then a call to the procedure may contain more actual arguments
than the procedure has formals. In this case, all of the actual arguments
starting at the one that would be assigned to \fBargs\fR are combined into
a list (as if the \fBlist\fR command had been used); this combined value
is assigned to the local variable \fBargs\fR.
.PP
When \fIbody\fR is being executed, variable names normally refer to
local variables, which are created automatically when referenced and
deleted when the procedure returns. One local variable is automatically
created for each of the procedure's arguments.
Global variables can only be accessed by invoking
the \fBglobal\fR command or the \fBupvar\fR command.
Namespace variables can only be accessed by invoking
the \fBvariable\fR command or the \fBupvar\fR command.
.PP
The \fBproc\fR command returns an empty string. When a procedure is
invoked, the procedure's return value is the value specified in a
\fBreturn\fR command. If the procedure doesn't execute an explicit
\fBreturn\fR command. If the procedure does not execute an explicit
\fBreturn\fR, then its return value is the value of the last command
executed in the procedure's body.
If an error occurs while executing the procedure
body, then the procedure-as-a-whole will return that same error.
.SH EXAMPLES
This is a procedure that accepts arbitrarily many arguments and prints
them out, one by one.
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