51 lines
2.2 KiB
Plaintext
51 lines
2.2 KiB
Plaintext
'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" All rights reserved.
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'\"
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'\" Permission is hereby granted, without written agreement and without
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'\" license or royalty fees, to use, copy, modify, and distribute this
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'\" documentation for any purpose, provided that the above copyright
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'\" notice and the following two paragraphs appear in all copies.
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'\"
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'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
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'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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'\"
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'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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'\"
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'\" $Header: /user6/ouster/tcl/man/RCS/catch.n,v 1.1 93/04/14 16:52:57 ouster Exp $ SPRITE (Berkeley)
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'\"
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.so man.macros
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.HS catch tcl
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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catch \- Evaluate script and trap exceptional returns
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.SH SYNOPSIS
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\fBcatch\fI script \fR?\fIvarName\fR?
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.BE
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.SH DESCRIPTION
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.PP
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The \fBcatch\fR command may be used to prevent errors from aborting
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command interpretation. \fBCatch\fR calls the Tcl interpreter recursively
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to execute \fIscript\fR, and always returns a TCL_OK code, regardless of
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any errors that might occur while executing \fIscript\fR. The return
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value from \fBcatch\fR is a decimal string giving the
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code returned by the Tcl interpreter after executing \fIscript\fR.
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This will be \fB0\fR (TCL_OK) if there were no errors in \fIscript\fR;
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otherwise
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it will have a non-zero value corresponding to one of the exceptional
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return codes (see tcl.h for the definitions of code values). If the
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\fIvarName\fR argument is given, then it gives the name of a variable;
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\fBcatch\fR will set the variable to the string returned
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from \fIscript\fR (either a result or an error message).
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.SH KEYWORDS
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catch, error
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