Интерактивная система просмотра системных руководств (man-ов)
unalias (1)
unalias (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
unalias (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
unalias (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
>> unalias (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
NAME
unalias - remove alias definitions
SYNOPSIS
unaliasalias-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, Internationalization 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 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
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 original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
