56 lines
2.4 KiB
Plaintext
56 lines
2.4 KiB
Plaintext
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'\"
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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/unknown.n,v 1.2 93/10/13 17:19:06 ouster Exp $ SPRITE (Berkeley)
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'\"
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.so man.macros
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.HS unknown 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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unknown \- Handle attempts to use non-existent commands
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.SH SYNOPSIS
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\fBunknown \fIcmdName \fR?\fIarg arg ...\fR?
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.BE
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.SH DESCRIPTION
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.PP
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This command doesn't actually exist as part of Tcl, but Tcl will
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invoke it if it does exist.
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If the Tcl interpreter encounters a command name for which there
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is not a defined command, then Tcl checks for the existence of
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a command named \fBunknown\fR.
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If there is no such command, then the interpreter returns an
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error.
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If the \fBunknown\fR command exists, then it is invoked with
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arguments consisting of the fully-substituted name and arguments
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for the original non-existent command.
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The \fBunknown\fR command typically does things like searching
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through library directories for a command procedure with the name
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\fIcmdName\fR, or expanding abbreviated command names to full-length,
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or automatically executing unknown commands as sub-processes.
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In some cases (such as expanding abbreviations) \fBunknown\fR will
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change the original command slightly and then (re-)execute it.
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The result of the \fBunknown\fR command is used as the result for
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the original non-existent command.
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.SH KEYWORDS
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error, non-existent command
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