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'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 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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'\" SCCS: @(#) set.n 1.5 96/03/25 20:23:07
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'\"
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.so man.macros
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.TH set n "" Tcl "Tcl Built-In Commands"
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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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set \- Read and write variables
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.SH SYNOPSIS
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\fBset \fIvarName \fR?\fIvalue\fR?
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.BE
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.SH DESCRIPTION
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.PP
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Returns the value of variable \fIvarName\fR.
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If \fIvalue\fR is specified, then set
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the value of \fIvarName\fR to \fIvalue\fR, creating a new variable
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if one doesn't already exist, and return its value.
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If \fIvarName\fR contains an open parenthesis and ends with a
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close parenthesis, then it refers to an array element: the characters
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before the first open parenthesis are the name of the array, and the characters
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between the parentheses are the index within the array.
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Otherwise \fIvarName\fR refers to a scalar variable.
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If no procedure is active, then \fIvarName\fR refers to a global
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variable.
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If a procedure is active, then \fIvarName\fR refers to a parameter
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or local variable of the procedure unless the \fIglobal\fR command
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has been invoked to declare \fIvarName\fR to be global.
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.SH KEYWORDS
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read, write, variable
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