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UNALIAS(1P)		   POSIX Programmer's Manual		   UNALIAS(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       unalias — remove alias definitions

SYNOPSIS
       unalias alias-name...

       unalias −a

DESCRIPTION
       The unalias utility shall remove the definition	for  each  alias  name
       specified. See Section 2.3.1, Alias Substitution.  The aliases shall be
       removed from the current shell execution environment; see Section 2.12,
       Shell Execution Environment.

OPTIONS
       The  unalias  utility  shall  conform to the Base Definitions volume of
       POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines.

       The following option shall be supported:

       −a	 Remove all alias definitions from the current shell execution
		 environment.

OPERANDS
       The following operand shall be supported:

       alias-name
		 The name of an alias to be removed.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The  following environment variables shall affect the execution of una‐
       lias:

       LANG	 Provide a default value for  the  internationalization	 vari‐
		 ables	that are unset or null. (See the Base Definitions vol‐
		 ume of POSIX.1‐2008, Section 8.2, Internationalization	 Vari‐
		 ables	for  the  precedence of internationalization variables
		 used to determine the values of locale categories.)

       LC_ALL	 If set to a non-empty string value, override  the  values  of
		 all the other internationalization variables.

       LC_CTYPE	 Determine  the	 locale for the interpretation of sequences of
		 bytes of text data as characters (for example, single-byte as
		 opposed to multi-byte characters in arguments).

       LC_MESSAGES
		 Determine the locale that should be used to affect the format
		 and contents  of  diagnostic  messages	 written  to  standard
		 error.

       NLSPATH	 Determine the location of message catalogs for the processing
		 of LC_MESSAGES.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0    Successful completion.

       >0    One of the alias-name operands  specified	did  not  represent  a
	     valid alias definition, or an error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       Since  unalias  affects	the current shell execution environment, it is
       generally provided as a shell regular built-in.

EXAMPLES
       None.

RATIONALE
       The unalias description is based	 on  that  from	 historical  KornShell
       implementations.	 Known differences exist between that and the C shell.
       The KornShell version was adopted to be consistent with all  the	 other
       KornShell features in this volume of POSIX.1‐2008, such as command line
       editing.

       The −a option is the equivalent of the unalias * form of	 the  C	 shell
       and  is	provided  to  address  security concerns about unknown aliases
       entering the environment of a user (or application) through the	allow‐
       able implementation-defined predefined alias route or as a result of an
       ENV file. (Although unalias could be used to  simplify  the  ``secure''
       shell  script  shown  in the command rationale, it does not obviate the
       need to quote all command names. An initial call to  unalias  −a	 would
       have to be quoted in case there was an alias for unalias.)

FUTURE DIRECTIONS
       None.

SEE ALSO
       Chapter 2, Shell Command Language, alias

       The  Base  Definitions  volume  of POSIX.1‐2008, Chapter 8, Environment
       Variables, Section 12.2, Utility Syntax Guidelines

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   UNALIAS(1P)
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