who

who [OPTIONS] [FILE]...

Print information about users who are currently logged in.

Options

--help, -h

Print help information

--version, -V

Print version information

--all, -a

same as -b -d --login -p -r -t -T -u

--boot, -b

time of last system boot

--dead, -d

print dead processes

--heading, -H

print line of column headings

--login, -l

print system login processes

--lookup

attempt to canonicalize hostnames via DNS

-m

only hostname and user associated with stdin

--process, -p

print active processes spawned by init

--count, -q

all login names and number of users logged on

--runlevel, -r

print current runlevel

--short, -s

print only name, line, and time (default)

--time, -t

print last system clock change

--users, -u

list users logged in

--mesg, --message, --writable, -T

add user's message status as +, - or ?

-w

same as -T