39 lines
1.9 KiB
HTML
39 lines
1.9 KiB
HTML
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<HTML><HEAD><TITLE>Tcl Built-In Commands - subst manual page</TITLE></HEAD><BODY>
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<H3><A NAME="M2">NAME</A></H3>
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subst - Perform backslash, command, and variable substitutions
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>subst </B>?<B>-nobackslashes</B>? ?<B>-nocommands</B>? ?<B>-novariables</B>? <I>string</I><BR>
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<H3><A NAME="M4">DESCRIPTION</A></H3>
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This command performs variable substitutions, command substitutions,
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and backslash substitutions on its <I>string</I> argument and
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returns the fully-substituted result.
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The substitutions are performed in exactly the same way as for
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Tcl commands.
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As a result, the <I>string</I> argument is actually substituted twice,
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once by the Tcl parser in the usual fashion for Tcl commands, and
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again by the <I>subst</I> command.
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<P>
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If any of the <B>-nobackslashes</B>, <B>-nocommands</B>, or
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<B>-novariables</B> are specified, then the corresponding substitutions
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are not performed.
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For example, if <B>-nocommands</B> is specified, no command substitution
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is performed: open and close brackets are treated as ordinary characters
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with no special interpretation.
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<P>
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Note: when it performs its substitutions, <I>subst</I> does not
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give any special treatment to double quotes or curly braces. For
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example, the script
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<PRE><B>set a 44
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subst {xyz {$a}}</B></PRE>
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returns ``<B>xyz {44}</B>'', not ``<B>xyz {$a}</B>''.
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<H3><A NAME="M5">SEE ALSO</A></H3>
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<B><A HREF="../TkCmd/eval.htm">eval</A></B>
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<H3><A NAME="M6">KEYWORDS</A></H3>
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<A href="../Keywords/B.htm#backslash substitution">backslash substitution</A>, <A href="../Keywords/C.htm#command substitution">command substitution</A>, <A href="../Keywords/V.htm#variable substitution">variable substitution</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1994 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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