1UNALIAS(1P) POSIX Programmer's Manual UNALIAS(1P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 unalias - remove alias definitions
13
15 unalias alias-name...
16 unalias -a
18
21 The unalias utility shall remove the definition for each alias name
22 specified. See Alias Substitution . The aliases shall be removed from
23 the current shell execution environment; see Shell Execution Environ‐
24 ment .
25
27 The unalias utility shall conform to the Base Definitions volume of
28 IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
29 The following option shall be supported:
31 -a Remove all alias definitions from the current shell execution
33 environment.
34
37 The following operand shall be supported:
38 alias-name
40 The name of an alias to be removed.
41
44 Not used.
45
47 None.
48
50 The following environment variables shall affect the execution of una‐
51 lias:
52 LANG Provide a default value for the internationalization variables
54 that are unset or null. (See the Base Definitions volume of
55 IEEE Std 1003.1-2001, Section 8.2, Internationalization Vari‐
56 ables for the precedence of internationalization variables used
57 to determine the values of locale categories.)
58 LC_ALL If set to a non-empty string value, override the values of all
60 the other internationalization variables.
61 LC_CTYPE
63 Determine the locale for the interpretation of sequences of
64 bytes of text data as characters (for example, single-byte as
65 opposed to multi-byte characters in arguments).
66 LC_MESSAGES
68 Determine the locale that should be used to affect the format
69 and contents of diagnostic messages written to standard error.
70 NLSPATH
72 Determine the location of message catalogs for the processing of
73 LC_MESSAGES .
74
77 Default.
78
80 Not used.
81
83 The standard error shall be used only for diagnostic messages.
84
86 None.
87
89 None.
90
92 The following exit values shall be returned:
93 0 Successful completion.
95 >0 One of the alias-name operands specified did not represent a
97 valid alias definition, or an error occurred.
98
101 Default.
102 The following sections are informative.
104
106 Since unalias affects the current shell execution environment, it is
107 generally provided as a shell regular built-in.
108
110 None.
111
113 The unalias description is based on that from historical KornShell
114 implementations. Known differences exist between that and the C shell.
115 The KornShell version was adopted to be consistent with all the other
116 KornShell features in this volume of IEEE Std 1003.1-2001, such as com‐
117 mand line editing.
118 The -a option is the equivalent of the unalias * form of the C shell
120 and is provided to address security concerns about unknown aliases
121 entering the environment of a user (or application) through the allow‐
122 able implementation-defined predefined alias route or as a result of an
123 ENV file. (Although unalias could be used to simplify the "secure"
124 shell script shown in the command rationale, it does not obviate the
125 need to quote all command names. An initial call to unalias -a would
126 have to be quoted in case there was an alias for unalias.)
127
129 None.
130
132 Shell Command Language, alias
133
135 Portions of this text are reprinted and reproduced in electronic form
136 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
137 -- Portable Operating System Interface (POSIX), The Open Group Base
138 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
139 Electrical and Electronics Engineers, Inc and The Open Group. In the
140 event of any discrepancy between this version and the original IEEE and
141 The Open Group Standard, the original IEEE and The Open Group Standard
142 is the referee document. The original Standard can be obtained online
143 at http://www.opengroup.org/unix/online.html .
144IEEE/The Open Group 2003 UNALIAS(1P)