49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
|
'\"
|
||
|
|
'\" Copyright (c) 1994 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.
|
||
|
|
'\"
|
||
|
|
'\" SCCS: @(#) subst.n 1.9 96/03/25 20:24:17
|
||
|
|
'\"
|
||
|
|
.so man.macros
|
||
|
|
.TH subst n 7.4 Tcl "Tcl Built-In Commands"
|
||
|
|
.BS
|
||
|
|
'\" Note: do not modify the .SH NAME line immediately below!
|
||
|
|
.SH NAME
|
||
|
|
subst \- Perform backslash, command, and variable substitutions
|
||
|
|
.SH SYNOPSIS
|
||
|
|
\fBsubst \fR?\fB\-nobackslashes\fR? ?\fB\-nocommands\fR? ?\fB\-novariables\fR? \fIstring\fR
|
||
|
|
.BE
|
||
|
|
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.PP
|
||
|
|
This command performs variable substitutions, command substitutions,
|
||
|
|
and backslash substitutions on its \fIstring\fR argument and
|
||
|
|
returns the fully-substituted result.
|
||
|
|
The substitutions are performed in exactly the same way as for
|
||
|
|
Tcl commands.
|
||
|
|
As a result, the \fIstring\fR argument is actually substituted twice,
|
||
|
|
once by the Tcl parser in the usual fashion for Tcl commands, and
|
||
|
|
again by the \fIsubst\fR command.
|
||
|
|
.PP
|
||
|
|
If any of the \fB\-nobackslashes\fR, \fB\-nocommands\fR, or
|
||
|
|
\fB\-novariables\fR are specified, then the corresponding substitutions
|
||
|
|
are not performed.
|
||
|
|
For example, if \fB\-nocommands\fR is specified, no command substitution
|
||
|
|
is performed: open and close brackets are treated as ordinary characters
|
||
|
|
with no special interpretation.
|
||
|
|
.PP
|
||
|
|
Note: when it performs its substitutions, \fIsubst\fR does not
|
||
|
|
give any special treatment to double quotes or curly braces. For
|
||
|
|
example, the script
|
||
|
|
.CS
|
||
|
|
\fBset a 44
|
||
|
|
subst {xyz {$a}}\fR
|
||
|
|
.CE
|
||
|
|
returns ``\fBxyz {44}\fR'', not ``\fBxyz {$a}\fR''.
|
||
|
|
|
||
|
|
.SH KEYWORDS
|
||
|
|
backslash substitution, command substitution, variable substitution
|