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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "UNALIAS" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" unalias 
+.SH NAME
+unalias \- remove alias definitions
+.SH SYNOPSIS
+.LP
+\fBunalias\fP \fIalias-name\fP\fB...
+.br
+.sp
+unalias -a \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIunalias\fP utility shall remove the definition for each alias
+name specified. See \fIAlias Substitution\fP . The aliases shall be
+removed from the current shell execution
+environment; see \fIShell Execution Environment\fP .
+.SH OPTIONS
+.LP
+The \fIunalias\fP utility shall conform to the Base Definitions volume
+of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
+.LP
+The following option shall be supported:
+.TP 7
+\fB-a\fP
+Remove all alias definitions from the current shell execution environment.
+.sp
+.SH OPERANDS
+.LP
+The following operand shall be supported:
+.TP 7
+\fIalias-name\fP
+The name of an alias to be removed.
+.sp
+.SH STDIN
+.LP
+Not used.
+.SH INPUT FILES
+.LP
+None.
+.SH ENVIRONMENT VARIABLES
+.LP
+The following environment variables shall affect the execution of
+\fIunalias\fP:
+.TP 7
+\fILANG\fP
+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, Internationalization Variables
+for
+the precedence of internationalization variables used to determine
+the values of locale categories.)
+.TP 7
+\fILC_ALL\fP
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.TP 7
+\fILC_CTYPE\fP
+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).
+.TP 7
+\fILC_MESSAGES\fP
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard
+error.
+.TP 7
+\fINLSPATH\fP
+Determine the location of message catalogs for the processing of \fILC_MESSAGES
+\&.\fP 
+.sp
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+Not used.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+None.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+The following exit values shall be returned:
+.TP 7
+\ 0
+Successful completion.
+.TP 7
+>0
+One of the \fIalias-name\fP operands specified did not represent a
+valid alias definition, or an error occurred.
+.sp
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+Since \fIunalias\fP affects the current shell execution environment,
+it is generally provided as a shell regular built-in.
+.SH EXAMPLES
+.LP
+None.
+.SH RATIONALE
+.LP
+The \fIunalias\fP 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.
+.LP
+The \fB-a\fP option is the equivalent of the \fIunalias\fP * 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 \fIENV\fP file. (Although \fIunalias\fP
+could be used to simplify the "secure" shell script
+shown in the \fIcommand\fP rationale, it does not obviate the need
+to quote all command
+names. An initial call to \fIunalias\fP \fB-a\fP would have to be
+quoted in case there was an alias for \fIunalias\fP.)
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIShell Command Language\fP , \fIalias\fP
+.SH 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 original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .