same as −b −d −−login −p −r −t −T −u

time of last system boot

print dead processes

print line of column headings

print system login processes

attempt to canonicalize hostnames via DNS

only hostname and user associated with stdin

print active processes spawned by init

all login names and number of users logged on

print current runlevel

print only name, line, and time (default)

print last system clock change

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

list users logged in

same as −T

same as −T

display this help and exit

output version information and exit