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.TH LOGNAME 1 "October 25, 2019"
.SH NAME
logname \- return user's login name
.SH SYNOPSIS
.nf
\fBlogname\fR
.SH DESCRIPTION
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 ID of the calling process is used instead.
If a name cannot be found, the user's ID will be printed.
.SH ENVIRONMENT VARIABLES
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
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
.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
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
\fBenv\fR(1), \fBlogin\fR(1), \fBgetlogin\fR(3C), \fButmpx\fR(4),
\fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5)