The Linux kernel is named for its creator, Linus Torvalds. The practice of appending an X was for Unix and Unix-like systems.
date -u +%A
There is no "full form".
useradd <username> -c "Full name" passwd <username> userdel <username>
No direct abbreviation for lawyer. "Atty." is an abbreviation for "attorney."esq
All versions of the Linux kernel are "full featured." The latest stable version of the Linux kernel as of May 17, 2011 is 2.6.38.6.
The current Linux kernel version is 3.9.
Linux is the kernel.
Linux Trace Toolkit
It's name begin with a full stop, like .profile or .bash_history(ls .* or ls -a shows it nevertheless)
OpenOffice and LibreOffice are both full office suites used in Linux distributions.
The kernel.
There are no "joined" Linux and Windows operating systems, so there is no name for them.