V8/usr/man/man1/getuid.1

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.TH GETUID 1
.SH NAME
getuid, id \- get user identity
.SH SYNOPSIS
.B getuid
[
.B \-
] [
arguments
]
.PP
.B id
.SH DESCRIPTION
.I Getuid
prints on its standard output information about its invoker,
based on the effective user id, as presented in the password file.
With no arguments,
.I getuid
prints the login id of its invoker.
Arguments select which information to print:
.IP
.ta \w'passwd  'u
.nf
user	login id
group	group id
passwd	encrypted password
uid	numerical user id
gid	numerical group id
acct	GCOS account number
bin	GCOS output bin
home	home directory
shell	default shell
.fi
.PP
If the optional
.B \-
or more than one argument is present,
the information is displayed in the form
.IP
user=name
.LP
as suitable for setting environment variables in the shell.
.PP
.I Id
prints the effective userid and groupid numerically, and, if
possible, textually
.SH FILES
/etc/passwd
.br
/etc/group
.SH "SEE ALSO"
who(1), getuid(2), passwd(5), sh(1)
.SH BUGS
.I Getuid
reports the default group for the user,
not the current effective group id.
.br
The login id reported is the first one in the password file with
the correct numerical user id, not necessarily the login
for the current session.