who muestra quién está logeado en la máquina.
who sin argumentos puestra quién está logeado:
Ejemplo:
# who
guest pts/3 2009-05-04 07:56 (192.168.220.135)
guest2 pts/4 2009-05-04 07:57 (192.168.220.131)
s80usr pts/6 2009-05-04 11:41 (192.168.220.3)
#
SYNOPSIS
who [OPTION]… [ FILE | ARG1 ARG2 ]
DESCRIPTION
-a, –all
same as -b -d –login -p -r -t -T -u
-b, –boot
time of last system boot
-d, –dead
print dead processes
-H, –heading
print line of column headings
-l, –login
print system login processes
–lookup
attempt to canonicalize hostnames via DNS
-m only hostname and user associated with stdin
-p, –process
print active processes spawned by init
-q, –count
all login names and number of users logged on
-r, –runlevel
print current runlevel
-s, –short
print only name, line, and time (default)
-t, –time
print last system clock change
-T, -w, –mesg
add user’s message status as +, – or ?
-u, –users
list users logged in
–message
same as -T
–writable
same as -T
–help display this help and exit
–version
output version information and exit
If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common. If ARG1 ARG2
given, -m presumed: `am i’ or `mom likes’ are usual.