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LOGNAME(1P) POSIX Programmer's Manual LOGNAME(1P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
logname — return the user's login name
logname
The logname utility shall write the user's login name to standard
output. The login name shall be the string that would be returned by
the getlogin() function defined in the System Interfaces volume of
POSIX.1‐2008. Under the conditions where the getlogin() function
would fail, the logname utility shall write a diagnostic message to
standard error and exit with a non-zero exit status.
None.
None.
Not used.
None.
The following environment variables shall affect the execution of
logname:
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.
Default.
The logname utility output shall be a single line consisting of the
user's login name:
"%s\n", <login name>
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
Default.
The following sections are informative.
The logname utility explicitly ignores the LOGNAME environment
variable because environment changes could produce erroneous results.
None.
The passwd file is not listed as required because the implementation
may have other means of mapping login names.
None.
id(1p), who(1p)
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables
The System Interfaces volume of POSIX.1‐2008, getlogin(3p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 LOGNAME(1P)
Pages that refer to this page: id(1p)