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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 IEEE Std 1003.1-2001.
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 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.
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 , who
, the System Interfaces volume of IEEE Std 1003.1-2001, getlogin()
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
.
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