Linux file system
As the title says, what is the intended purpose of top-level linux/unix directories and what should they contain? What is the meaning of their names? e.g. /var /etc /opt /usr
Is there a definitive guide that applies to all flavours/flavors/releases/distributions of Unix and Linux?
It seems to me to be arbitrary as to what the purpose of these directory/folders are and what should go in them.
What did the developers/creators of Unix and Linux variants have in mind for the design and naming?
The reason why I ask is not academic discussion but for better understanding of the system to promote:
- more efficient, cleaner, precise, repeatable maintenance and enhancements
- faster more efficient troubleshooting of problems
- faster more efficient management of installations
- locate certain files faster
- write platform/distribution independent applications that install in the correct locations that can, for example run on any Linux distribution
I would also like answers for the sub-directories of these, e.g. /usr/lib /usr/local/ /var/lib etc... please.
I know that there are other factors that can influence the above items but am just looking for answers to my question here.
Thanks in advance.