Linux notes

skill -STOP -u username Pause somebody.
skill -KILL -u username Kick out somebody.
skill -KILL -v /dev/pts/* Kick all out.

last show successful logins
lastb show bad logins
lastlog show latest logins of all/any users.
/var/log/btmp bad logins
/var/log/wtmp successful logins
/var/run/utmp current logins

Set date and time
# date -s "2 OCT 2006 18:00:00"
# date --set="2 OCT 2006 18:00:00"
# date +%Y%m%d -s "20081128"
# date +%T -s "10:13:13"

Get hardware info
/sbin/lspci
/sbin/lsusb
lshw

route -n
shows the routing table, the gateway will be flagged with a 'G'

If DNS is not properly configured, go to /etc/resolv.conf, check or add line nameserver x.x.x.x

To pipe wget download content:
wget -q url -O - | cat > abc.txt

For ubuntu 10.10
Edit /etc/default/grub & run update-grub to set the booting preferences