mirror of https://github.com/mkerrisk/man-pages
147 lines
4.2 KiB
Groff
147 lines
4.2 KiB
Groff
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "UNALIAS" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" unalias
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.SH NAME
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unalias \- remove alias definitions
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.SH SYNOPSIS
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.LP
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\fBunalias\fP \fIalias-name\fP\fB...
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.br
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.sp
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unalias -a \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIunalias\fP utility shall remove the definition for each alias
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name specified. See \fIAlias Substitution\fP . The aliases shall be
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removed from the current shell execution
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environment; see \fIShell Execution Environment\fP .
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.SH OPTIONS
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.LP
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The \fIunalias\fP utility shall conform to the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
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.LP
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The following option shall be supported:
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.TP 7
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\fB-a\fP
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Remove all alias definitions from the current shell execution environment.
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.sp
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.SH OPERANDS
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.LP
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The following operand shall be supported:
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.TP 7
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\fIalias-name\fP
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The name of an alias to be removed.
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.sp
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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None.
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.SH ENVIRONMENT VARIABLES
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.LP
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The following environment variables shall affect the execution of
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\fIunalias\fP:
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.TP 7
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\fILANG\fP
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Provide a default value for the internationalization variables that
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are unset or null. (See the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
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for
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the precedence of internationalization variables used to determine
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the values of locale categories.)
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.TP 7
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\fILC_ALL\fP
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If set to a non-empty string value, override the values of all the
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other internationalization variables.
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.TP 7
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\fILC_CTYPE\fP
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Determine the locale for the interpretation of sequences of bytes
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of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).
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.TP 7
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\fILC_MESSAGES\fP
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Determine the locale that should be used to affect the format and
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contents of diagnostic messages written to standard
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error.
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.TP 7
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\fINLSPATH\fP
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Determine the location of message catalogs for the processing of \fILC_MESSAGES
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\&.\fP
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.sp
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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Not used.
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.SH STDERR
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.LP
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The standard error shall be used only for diagnostic messages.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The following exit values shall be returned:
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.TP 7
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\ 0
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Successful completion.
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.TP 7
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>0
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One of the \fIalias-name\fP operands specified did not represent a
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valid alias definition, or an error occurred.
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.sp
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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Since \fIunalias\fP affects the current shell execution environment,
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it is generally provided as a shell regular built-in.
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.SH EXAMPLES
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.LP
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None.
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.SH RATIONALE
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.LP
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The \fIunalias\fP description is based on that from historical KornShell
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implementations. Known differences exist between that
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and the C shell. The KornShell version was adopted to be consistent
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with all the other KornShell features in this volume of
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IEEE\ Std\ 1003.1-2001, such as command line editing.
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.LP
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The \fB-a\fP option is the equivalent of the \fIunalias\fP * form
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of the C shell and is provided to address security concerns
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about unknown aliases entering the environment of a user (or application)
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through the allowable implementation-defined predefined
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alias route or as a result of an \fIENV\fP file. (Although \fIunalias\fP
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could be used to simplify the "secure" shell script
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shown in the \fIcommand\fP rationale, it does not obviate the need
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to quote all command
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names. An initial call to \fIunalias\fP \fB-a\fP would have to be
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quoted in case there was an alias for \fIunalias\fP.)
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIShell Command Language\fP , \fIalias\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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