Subversion Repositories or1k_old

'\"

'\" Copyright (c) 1993-1994 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.

'\"

'\" RCS: @(#) $Id: catch.n,v 1.1.1.1 2002-01-16 10:25:24 markom Exp $

'\"

.so man.macros

.TH catch n "" Tcl "Tcl Built-In Commands"

.BS

'\" Note:  do not modify the .SH NAME line immediately below!

.SH NAME

catch \- Evaluate script and trap exceptional returns

.SH SYNOPSIS

\fBcatch\fI script \fR?\fIvarName\fR?

.BE

.SH DESCRIPTION

.PP

The \fBcatch\fR command may be used to prevent errors from aborting

command interpretation.  \fBCatch\fR calls the Tcl interpreter recursively

to execute \fIscript\fR, and always returns a TCL_OK code, regardless of

any errors that might occur while executing \fIscript\fR.  The return

value from \fBcatch\fR is a decimal string giving the

code returned by the Tcl interpreter after executing \fIscript\fR.

This will be \fB0\fR (TCL_OK) if there were no errors in \fIscript\fR;

otherwise

it will have a non-zero value corresponding to one of the exceptional

return codes (see tcl.h for the definitions of code values).  If the

\fIvarName\fR argument is given, then it gives the name of a variable;

\fBcatch\fR will set the variable to the string returned

from \fIscript\fR (either a result or an error message).

.PP

Note that \fBcatch\fR catches all exceptions, including those

generated by \fBbreak\fR and \fBcontinue\fR as well as errors.

.SH KEYWORDS

catch, error