39 lines
1.9 KiB
HTML
39 lines
1.9 KiB
HTML
<HTML><HEAD><TITLE>Tcl Built-In Commands - subst manual page</TITLE></HEAD><BODY>
|
|
<H3><A NAME="M2">NAME</A></H3>
|
|
subst - Perform backslash, command, and variable substitutions
|
|
<H3><A NAME="M3">SYNOPSIS</A></H3>
|
|
<B>subst </B>?<B>-nobackslashes</B>? ?<B>-nocommands</B>? ?<B>-novariables</B>? <I>string</I><BR>
|
|
<H3><A NAME="M4">DESCRIPTION</A></H3>
|
|
This command performs variable substitutions, command substitutions,
|
|
and backslash substitutions on its <I>string</I> argument and
|
|
returns the fully-substituted result.
|
|
The substitutions are performed in exactly the same way as for
|
|
Tcl commands.
|
|
As a result, the <I>string</I> argument is actually substituted twice,
|
|
once by the Tcl parser in the usual fashion for Tcl commands, and
|
|
again by the <I>subst</I> command.
|
|
<P>
|
|
If any of the <B>-nobackslashes</B>, <B>-nocommands</B>, or
|
|
<B>-novariables</B> are specified, then the corresponding substitutions
|
|
are not performed.
|
|
For example, if <B>-nocommands</B> is specified, no command substitution
|
|
is performed: open and close brackets are treated as ordinary characters
|
|
with no special interpretation.
|
|
<P>
|
|
Note: when it performs its substitutions, <I>subst</I> does not
|
|
give any special treatment to double quotes or curly braces. For
|
|
example, the script
|
|
<PRE><B>set a 44
|
|
subst {xyz {$a}}</B></PRE>
|
|
returns ``<B>xyz {44}</B>'', not ``<B>xyz {$a}</B>''.
|
|
|
|
<H3><A NAME="M5">SEE ALSO</A></H3>
|
|
<B><A HREF="../TkCmd/eval.htm">eval</A></B>
|
|
<H3><A NAME="M6">KEYWORDS</A></H3>
|
|
<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>
|
|
<HR><PRE>
|
|
<A HREF="../copyright.htm">Copyright</A> © 1994 The Regents of the University of California.
|
|
<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
|
|
<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
|
|
</BODY></HTML>
|