Recipe: Info about logged users, boot logs, failure boot

who
===
$ who
slynux   pts/0   2010-09-29 05:24 (slynuxs-macbook-pro.local)
slynux   tty7    2010-09-29 07:08 (:0) 

w
=
$ w
 07:09:05 up  1:45,  2 users,  load average: 0.12, 0.06, 0.02
USER     TTY     FROM    LOGIN@   IDLE  JCPU PCPU WHAT
slynux   pts/0   slynuxs 05:24  0.00s  0.65s 0.11s sshd: slynux 
slynux   tty7    :0      07:08  1:45m  3.28s 0.26s gnome-session

users
=====
$ users
slynux slynux slynux hacker

Unique users
============
$ users | tr ' ' '\n' | sort | uniq
slynux
hacker

uptime
======
$ uptime 
 21:44:33 up  3:17,  8 users,  load average: 0.09, 0.14, 0.09

last
====
$ last
slynux   tty7         :0               Tue Sep 28 18:27   still logged in   
reboot   system boot  2.6.32-21-generi Tue Sep 28 18:10 - 21:46  (03:35)    
slynux   pts/0        :0.0             Tue Sep 28 05:31 - crash  (12:39)    

$ last reboot
reboot   system boot  2.6.32-21-generi Tue Sep 28 18:10 - 21:48  (03:37)    
reboot   system boot  2.6.32-21-generi Tue Sep 28 05:14 - 21:48  (16:33)