Using the Linux last command to view re-boot history.
C:\HOME\FLYNN\DOCUMENTS> last reboot reboot system boot 3.4.0-rc2-bejiit Sat Aug 4 12:50 - 14:29 (01:39) reboot system boot 3.4.0-rc2-bejiit Fri Aug 3 21:11 - 21:16 (00:05) reboot system boot 3.4.0-rc2-bejiit Fri Aug 3 20:21 - 20:57 (00:36) reboot system boot 3.4.0-rc2-bejiit Fri Aug 3 11:35 - 20:00 (08:24) reboot system boot 3.5.0-rc4-custom Fri Aug 3 11:25 - 11:34 (00:08) wtmp begins Wed Aug 1 17:29:31 2012
To view all failed login attempts, the lastb command will suffice.
C:\HOME\FLYNN\DOCUMENTS> sudo lastb UNKNOWN tty2 Wed Aug 1 22:31 - 22:31 (00:00) btmp begins Wed Aug 1 22:31:03 2012
To lookup a unit conversion easily, the units command is the one stop shop for converting and looking up the value of a specific unit of measurement.
C:\HOME\FLYNN\DOCUMENTS> units -t '1 hogshead' 0.23848094 m^3 C:\HOME\FLYNN\DOCUMENTS> units -t '1 parsec' 3.0856776e+16 m
If you travelled 800 meters in 9.58 seconds how fast are you going now?
C:\HOME\FLYNN\DOCUMENTS> units -t '800m/9.58s' 'miles/hour' 186.80053
This command displays the DNS information about a particular host.
C:\HOME\FLYNN\DOCUMENTS> host google.com google.com has address 188.8.131.52 google.com has address 184.108.40.206 google.com has address 220.127.116.11 google.com has address 18.104.22.168 google.com has address 22.214.171.124 google.com has address 126.96.36.199 google.com has address 188.8.131.52 google.com has address 184.108.40.206 google.com has address 220.127.116.11 google.com has address 18.104.22.168 google.com has address 22.214.171.124 google.com has IPv6 address 2404:6800:4006:804::1003 google.com mail is handled by 50 alt4.aspmx.l.google.com. google.com mail is handled by 10 aspmx.l.google.com. google.com mail is handled by 20 alt1.aspmx.l.google.com. google.com mail is handled by 30 alt2.aspmx.l.google.com. google.com mail is handled by 40 alt3.aspmx.l.google.com.
To list the IP addresses for your network interfaces, use the ip command.
C:\HOME\FLYNN\DOCUMENTS> ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 6c:f0:49:b5:e6:2a brd ff:ff:ff:ff:ff:ff inet 192.168.1.4/24 brd 192.168.1.255 scope global eth0 inet6 fe80::6ef0:49ff:feb5:e62a/64 scope link valid_lft forever preferred_lft forever 3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000 link/ether 00:13:46:3a:02:83 brd ff:ff:ff:ff:ff:ff