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

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 Alias
       Substitution . The aliases shall be removed from the current shell execution  environment;
       see Shell Execution Environment .

OPTIONS
       The  unalias utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001,
       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 unalias:

       LANG   Provide a default value for the internationalization variables that  are	unset  or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables 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 interna-
	      tionalization 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 argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic 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 defini-
	      tion, 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 IEEE Std 1003.1-2001,
       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 allowable 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
       Shell Command Language , alias

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       UNALIAS(P)
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