SunOS man pages : who (1)
User Commands who(1)
NAME
who - who is on the system
SYNOPSIS
/usr/bin/who [ -abdHlmpqrstTu ] [ file ]
/usr/bin/who -q [ -n x ] [ file ]
/usr/bin/who am i
/usr/bin/who am I
/usr/xpg4/bin/who [ -abdHlmpqrtTu ] [ file ]
/usr/xpg4/bin/who -q [ -n x ] [ file ]
/usr/xpg4/bin/who -s [ -bdHlmpqrtu ] [ file ]
/usr/xpg4/bin/who am i
/usr/xpg4/bin/who am I
DESCRIPTION
The who utility can list the user's name, terminal line,
login time, elapsed time since activity occurred on the
line, and the process-ID of the command interpreter (shell)
for each current UNIX system user. It examines the
/var/adm/utmp file to obtain its information. If file is
given, that file (which must be in utmp(4) format) is exam-
ined. Usually, file will be /var/adm/wtmp, which contains a
history of all the logins since the file was last created.
The general format for output is:
name [state] line time [idle] [pid] [comment] [exit]
where:
name user's login name.
state capability of writing to the terminal.
line name of the line found in /dev.
time time since user's login.
idle time elapsed since the user's last activity.
pid user's process id.
comment
SunOS 5.8 Last change: 18 Mar 1997 1
User Commands who(1)
comment line in inittab(4).
exit exit status for dead processes.
OPTIONS
The following options are supported:
-a Process /var/adm/utmp or the named file with -b, -d,
-l, -p, -r, -t, -T, and -u options turned on.
-b Indicate the time and date of the last reboot.
-d Display all processes that have expired and not been
respawned by init. The exit field appears for dead
processes and contains the termination and exit values
(as returned by wait(3UCB)), of the dead process. This
can be useful in determining why a process terminated.
-H Output column headings above the regular output.
-l List only those lines on which the system is waiting
for someone to login. The name field is LOGIN in such
cases. Other fields are the same as for user entries
except that the state field does not exist.
-m Output only information about the current terminal.
-n x Take a numeric argument, x, which specifies the number
of users to display per line. x must be at least 1.
The -n option may only be used with -q.
-p List any other process which is currently active and
has been previously spawned by init. The name field is
the name of the program executed by init as found in
/sbin/inittab. The state, line, and idle fields have
no meaning. The comment field shows the id field of
the line from /sbin/inittab that spawned this process.
See inittab(4).
-q (quick who) display only the names and the number of
users currently logged on. When this option is used,
all other options are ignored.
-r Indicate the current run-level of the init process.
-s (default) List only the name, line, and time fields.
/usr/bin/who
-T Same as the -s option, except that the state idle,
pid, and comment, fields are also written. state is
one of the following characters:
SunOS 5.8 Last change: 18 Mar 1997 2
User Commands who(1)
+ The terminal allows write access to other users.
- The terminal denies write access to other users.
? The terminal write-access state cannot be deter-
mined.
/usr/xpg4/bin/who
-T Same as the -s option, except that the state field is
also written. state is one of the characters listed
under the /usr/bin/who version of this option. If the
-u option is used with -T, the idle time is added to
the end of the previous format.
-t Indicate the last change to the system clock (using
the date utility) by root. See su(1M) and date(1).
-u List only those users who are currently logged in. The
name is the user's login name. The line is the name of
the line as found in the directory /dev. The time is
the time that the user logged in. The idle column con-
tains the number of hours and minutes since activity
last occurred on that particular line. A dot (.) indi-
cates that the terminal has seen activity in the last
minute and is therefore ``current''. If more than
twenty-four hours have elapsed or the line has not
been used since boot time, the entry is marked old.
This field is useful when trying to determine whether
a person is working at the terminal or not. The pid is
the process-ID of the user's shell. The comment is the
comment field associated with this line as found in
/sbin/inittab (see inittab(4)). This can contain
information about where the terminal is located, the
telephone number of the dataset, type of terminal if
hard-wired, and so forth.
OPERANDS
The following operands are supported:
am i
am I In the "C" locale, limit the output to describing the
invoking user, equivalent to the -m option. The am and
i or I must be separate arguments.
file Specify a path name of a file to substitute for the
database of logged-on users that who uses by default.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of who: LC_CTYPE,
SunOS 5.8 Last change: 18 Mar 1997 3
User Commands who(1)
LC_MESSAGES, LC_TIME, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
FILES
/sbin/inittab
script for init.
/var/adm/utmp
current user and accounting information
/var/adm/wtmp
historic user and accounting information
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
/usr/bin/who
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
/usr/xpg4/bin/who
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWxcu4 |
|_____________________________|_____________________________|
SEE ALSO
date(1), login(1), mesg(1), init(1M), su(1M), wait(3UCB),
inittab(4), utmp(4), attributes(5), environ(5), XPG4(5)
NOTES
Super user: After a shutdown to the single-user state, who
returns a prompt; since /var/adm/utmp is updated at login
time and there is no login in single-user state, who cannot
report accurately on this state. who am i, however, returns
the correct information.
SunOS 5.8 Last change: 18 Mar 1997 4
|
 |
|
|
