What luks, lvm and mdadm layouts are bootable?

The only supported by default configuration layout is mdadm at the lowest
layer, then lvm and luks in any order.

(tested on Debian 8, initramfs-tools)

What luks, lvm and mdadm layouts are bootable?

The only supported by default configuration layout is mdadm at the lowest
layer, then lvm and luks in any order.

XKB useModMapMods, remapping Ctrl+Esc to Win and xmonad

Contents:
1. What useModMapMods in XKB interpretations means exactly?
2. Map Ctrl+Esc to Win key (Mod4) using XKB.
3. Using Ctrl+Esc as xmonad modMask.

X11 authentication and remote X clients

There is several methods of display access control, but the most used are two:
Host Access controlled by `xhost` and MIT-MAGIC-COOKIE-1 controlled by
`xauth`. Below is just what you can find in man, and may be a little more.

git filter-branch '--subdirectory-filter' preserving '--no-ff' merges.

(update2, 3/6/2013)

Well, in fact, the name is a bit misleading, because '--subdirectory-filter'
does not preserve merge commits created after fast-forward merge (with
'--no-ff' option). I think, this is because such commits are empty and do not
change any files in subdirectory (so, this is not a bug).

Anyway, i want to split subdirectory into separate project, preserving --no-ff
merge commits.