Add support for paths for Arch Linux

[raphaelcohn]

Add support for paths for Arch Linux

[Anton-Latukha]

I have some experience with that. I use Arch for 6-7 years.

If it is about PATH and env, of course ArchWiki:
https://wiki.archlinux.org/index.php/Environment_variables

For my knowledge there is noting special there about Arch.

If it is about special filesystem moments, yes they are on Arch:
/bin, /sbin, /usr/sbin -symlinkTo> /usr/bin
/lib, /lib64, /usr/lib64 -symlinkTo> /usr/lib

Arch Linux filesystem man here: http://jlk.fjfi.cvut.cz/arch/manpages/man/file-hierarchy.7

Main of that moments here: https://wiki.archlinux.org/index.php/Frequently_asked_questions#Does_Arch_follow_the_FHS.3F

Also important things:

• Yes, Arch third-party/custom applications use /opt. And they symlink binary to /usr/bin.
• On all Linux distros /usr/bin/python is python2. But Arch went ahead with initiative to makepython3 defacto. /usr/bin/python is python3 on Arch Linux, and that hits users in the head even after these years.

Seems that is all special I know about Arch.

[raphaelcohn]

Would be a great thing to do. Just submit a PR against the paths.d repository. Might be easiest to clone the paths for Ubuntu, write a simple shell script, and see what's where with Arch's installer.