Using the proc file system:

cat /proc/pci
cat /proc/interrupts
cat /proc/bus/usb/devicecs
cat /proc/scsi/scsi
cat /proc/cpuinfo
cat /proc/cmdline
procinfo -f

How much RAM is available?
free -m

Which version of XFree86 am I using?
X -version

Sort disc usage from largest to smallet:
du / |sort -nr|most
(will take a while on large drives)

What's my resolution?
xvidtune -show

OR
xrandr|grep \*

What ports are open on the localhost?
nmap localhost

How to turn on/off energy star features:
xset +/-dpms

How to kill an X app that won't exit normally:
xkill

How to remount a disc in read-write mode?
mount -o remount,rw /dev/hdx?

How to generate ssh keys?
ssh-keygen -b 1024 -t rsa1 -f /etc/ssh/ssh_host_key -N ""
ssh-keygen -b 1024 -t rsa -f /etc/ssh/ssh_host_rsa_key -N ""
ssh-keygen -b 1024 -t dsa -f /etc/ssh/ssh_host_dsa_key -N ""

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