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+'\" et
+.TH LOGNAME "1P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH PROLOG
+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.
+
+.SH NAME
+logname
+\(em return the user's login name
+.SH SYNOPSIS
+.LP
+.nf
+logname
+.fi
+.SH DESCRIPTION
+The
+.IR 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
+\fIgetlogin\fR()
+function defined in the System Interfaces volume of POSIX.1\(hy2008. Under the conditions where the
+\fIgetlogin\fR()
+function would fail, the
+.IR logname
+utility shall write a diagnostic message to standard error and exit
+with a non-zero exit status.
+.SH OPTIONS
+None.
+.SH OPERANDS
+None.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+The following environment variables shall affect the execution of
+.IR logname :
+.IP "\fILANG\fP" 10
+Provide a default value for the internationalization variables that are
+unset or null. (See the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 8.2" ", " "Internationalization Variables"
+for the precedence of internationalization variables used to determine
+the values of locale categories.)
+.IP "\fILC_ALL\fP" 10
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.IP "\fILC_CTYPE\fP" 10
+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).
+.IP "\fILC_MESSAGES\fP" 10
+.br
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard error.
+.IP "\fINLSPATH\fP" 10
+Determine the location of message catalogs for the processing of
+.IR LC_MESSAGES .
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+The
+.IR logname
+utility output shall be a single line consisting of the user's login
+name:
+.sp
+.RS 4
+.nf
+\fB
+"%s\en", <\fIlogin name\fR>
+.fi \fR
+.P
+.RE
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+The following exit values shall be returned:
+.IP "\00" 6
+Successful completion.
+.IP >0 6
+An error occurred.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+The
+.IR logname
+utility explicitly ignores the
+.IR LOGNAME
+environment variable because environment changes could produce
+erroneous results.
+.SH EXAMPLES
+None.
+.SH RATIONALE
+The
+.BR passwd
+file is not listed as required because the implementation may have
+other means of mapping login names.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIid\fR\^",
+.IR "\fIwho\fR\^"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "Chapter 8" ", " "Environment Variables"
+.P
+The System Interfaces volume of POSIX.1\(hy2008,
+.IR "\fIgetlogin\fR\^(\|)"
+.SH COPYRIGHT
+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 .