1LOGNAME(1P) POSIX Programmer's Manual LOGNAME(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 logname - return the user's login name
13
15 logname
16
18 The logname utility shall write the user's login name to standard out‐
19 put. The login name shall be the string that would be returned by the
20 getlogin() function defined in the System Interfaces volume of
21 IEEE Std 1003.1-2001. Under the conditions where the getlogin() func‐
22 tion would fail, the logname utility shall write a diagnostic message
23 to standard error and exit with a non-zero exit status.
24
26 None.
27
29 None.
30
32 Not used.
33
35 None.
36
38 The following environment variables shall affect the execution of log‐
39 name:
40 LANG Provide a default value for the internationalization variables
42 that are unset or null. (See the Base Definitions volume of
43 IEEE Std 1003.1-2001, Section 8.2, Internationalization Vari‐
44 ables for the precedence of internationalization variables used
45 to determine the values of locale categories.)
46 LC_ALL If set to a non-empty string value, override the values of all
48 the other internationalization variables.
49 LC_CTYPE
51 Determine the locale for the interpretation of sequences of
52 bytes of text data as characters (for example, single-byte as
53 opposed to multi-byte characters in arguments).
54 LC_MESSAGES
56 Determine the locale that should be used to affect the format
57 and contents of diagnostic messages written to standard error.
58 NLSPATH
60 Determine the location of message catalogs for the processing of
61 LC_MESSAGES .
62
65 Default.
66
68 The logname utility output shall be a single line consisting of the
69 user's login name:
70 "%s\n", <login name>
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75 The standard error shall be used only for diagnostic messages.
76
78 None.
79
81 None.
82
84 The following exit values shall be returned:
85 0 Successful completion.
87 >0 An error occurred.
89
92 Default.
93 The following sections are informative.
95
97 The logname utility explicitly ignores the LOGNAME environment variable
98 because environment changes could produce erroneous results.
99
101 None.
102
104 The passwd file is not listed as required because the implementation
105 may have other means of mapping login names.
106
108 None.
109
111 id, who, the System Interfaces volume of IEEE Std 1003.1-2001, getlo‐
112 gin()
113
115 Portions of this text are reprinted and reproduced in electronic form
116 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
117 -- Portable Operating System Interface (POSIX), The Open Group Base
118 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
119 Electrical and Electronics Engineers, Inc and The Open Group. In the
120 event of any discrepancy between this version and the original IEEE and
121 The Open Group Standard, the original IEEE and The Open Group Standard
122 is the referee document. The original Standard can be obtained online
123 at http://www.opengroup.org/unix/online.html .
124IEEE/The Open Group 2003 LOGNAME(1P)