This is the command unaliasposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 unalias:
LANG Provide a default value for the internationalization variables that are unset or
null. (See the Base Definitions volume of POSIX.1‐2008, 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 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 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.
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