Originální popis anglicky:
unalias - remove alias definitions
Návod, kniha: POSIX Programmer's Manual
unalias alias-name...
unalias -a
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 .
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.
The following operand shall be supported:
- alias-name
- The name of an alias to be removed.
Not used.
None.
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 .
Default.
Not used.
The standard error shall be used only for diagnostic messages.
None.
None.
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.
Default.
The following sections are informative.
Since
unalias affects the current shell execution environment, it is
generally provided as a shell regular built-in.
None.
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.)
None.
Shell Command Language ,
alias
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
.
