CLI is fun, but the commands can be a bit of a pain to remember. Here's some stuff I'm writing for my own reference, but it might be useful to you too.
1. Create a disk image
Web references also specify block size etc, but I didn't need them, apparently.
2. Mount that disk image
loop - used to mount files as block devices or something
$START - the start value of that partition in fdisk -l or fdisk /path/to/image
3. Turn screen off (as in power save mode)
Obtain the sdX->sgY mapping
1. Create a disk image
dd if=/dev/sda of=<fileName>
Web references also specify block size etc, but I didn't need them, apparently.
2. Mount that disk image
mount -o loop,offset=$START*512 -t [auto|FSType] /path/to/image /mount/point
loop - used to mount files as block devices or something
$START - the start value of that partition in fdisk -l or fdisk /path/to/image
3. Turn screen off (as in power save mode)
xset dpms force off
xset dpms force off; xscreensaver-command --lock #[Locks screen also]
4. Find the process using a file
fuser /dev/sda3
fuser /path/to/file
5. Spindown your HDD (eject from nautilus doesn't work)
Obtain the sdX->sgY mapping
sg_map
sdparm -C stop /dev/sgY
6. Install Ubuntu on newer UEFI systems along with Windows 8.
Ok, so Wubi won't work on the newer UEFI-enabled systems. So don't even bother. Either use Ubuntu as a Virtual Machine (tsk tsk...) or follow this guide.
http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-8-64-bit-system-uefi-supported
