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.TH LOGNAME 1 "Aug 11, 2009"
.SH NAME
logname \- return user's login name
.SH SYNOPSIS
.LP
.nf
\fB/usr/bin/logname\fR
.fi

.SS "ksh93"
.sp
.LP
\fBlogname\fR
.SH DESCRIPTION
.SS "/usr/bin/logname"
.sp
.LP
The \fBlogname\fR utility writes the user's login name to standard output. The
login name is the string that would be returned by the \fBgetlogin\fR(3C)
function. Under the conditions where \fBgetlogin()\fR would fail, \fBlogname\fR
will write a diagnostic message to standard error and exit with a non-zero exit
status.
.SS "ksh93"
.sp
.LP
The \fBlogname\fR utility writes the user's login name to standard output. The
login name is the string that would be returned by the \fBgetlogin\fR(3C)
function. If \fBgetlogin()\fR does not return successfully, the name
corresponding to the real user IDof the calling process is used instead.
.SH ENVIRONMENT VARIABLES
.sp
.LP
See \fBenviron\fR(5) for descriptions of the following environment variables
that affect the execution of \fBlogname\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.sp
.LP
The following error values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 6n
Successful completion.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
An error occurred.
.RE

.SH FILES
.sp
.ne 2
.na
\fB\fB/etc/profile\fR\fR
.ad
.RS 18n
environment for user at login time
.RE

.sp
.ne 2
.na
\fB\fB/var/adm/utmpx\fR\fR
.ad
.RS 18n
user and accounting information
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBenv\fR(1), \fBlogin\fR(1), \fBgetlogin\fR(3C), \fButmpx\fR(4),
\fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5)