41 lines
2.3 KiB
HTML
41 lines
2.3 KiB
HTML
<HTML><HEAD><TITLE>Built-In Commands - set manual page</TITLE></HEAD><BODY>
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<H3><A NAME="M2">NAME</A></H3>
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set - Read and write variables
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>set </B><I>varName </I>?<I>value</I>?<BR>
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<H3><A NAME="M4">DESCRIPTION</A></H3>
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Returns the value of variable <I>varName</I>.
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If <I>value</I> is specified, then set
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the value of <I>varName</I> to <I>value</I>, creating a new variable
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if one doesn't already exist, and return its value.
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If <I>varName</I> 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,
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and the characters between the parentheses are the index within the array.
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Otherwise <I>varName</I> refers to a scalar variable.
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Normally, <I>varName</I> is unqualified
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(does not include the names of any containing namespaces),
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and the variable of that name in the current namespace is read or written.
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If <I>varName</I> includes namespace qualifiers
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(in the array name if it refers to an array element),
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the variable in the specified namespace is read or written.
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<P>
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If no procedure is active,
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then <I>varName</I> refers to a namespace variable
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(global variable if the current namespace is the global namespace).
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If a procedure is active, then <I>varName</I> refers to a parameter
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or local variable of the procedure unless the <B><A HREF="../TkCmd/global.htm">global</A></B> command
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was invoked to declare <I>varName</I> to be global,
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or unless a <B><A HREF="../TkCmd/variable.htm">variable</A></B> command
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was invoked to declare <I>varName</I> to be a namespace variable.
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<H3><A NAME="M5">SEE ALSO</A></H3>
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<B><A HREF="../TkCmd/expr.htm">expr</A></B>, <B><A HREF="../TkCmd/proc.htm">proc</A></B>, <B><A HREF="../TkCmd/trace.htm">trace</A></B>, <B><A HREF="../TkCmd/unset.htm">unset</A></B>
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<H3><A NAME="M6">KEYWORDS</A></H3>
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<A href="../Keywords/R.htm#read">read</A>, <A href="../Keywords/W.htm#write">write</A>, <A href="../Keywords/V.htm#variable">variable</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1993 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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