The Linux File System Standard
Now if you're like me, you ask “What does this do for me?” Well, the answer depends upon just who “me” is. The FSSTND has an impact upon Linux users, system administrators, distributors, documenters, and developers.
If you are a Linux user, and you don't administrate your own Linux system (granted, this situation is somewhat rare) then the Linux FSSTND ensures that you will be able to find programs where you'd expect them to be if you've already had experience on another Linux machine. It also ensures that any documentation you may have makes sense. (From my own experience, nothing is more annoying than having inaccurate documentation!) Furthermore, if you've already had some experience with Unix before, then the FSSTND shouldn't be too different from what you're used to using, with some exceptions.
Perhaps the most important thing is that the development of a standard brings Linux to a level of maturity authors and commercial applications developers feel they can support that. The recent explosion of Linux-related books is proof of this. Before the FSSTND, it would have been difficult to write books about Linux, since each system was different. The FSSTND is solving all that.
If you administer your own machine, you gain all the benefits of the FSSTND mentioned above. You may also feel more secure in the ability of others to provide support for you, should you have a problem. Furthermore, periodic upgrades to your system are easier. Since there is an agreed-upon standard for the locations of files, package maintainers can provide instructions for upgrading that will not leave extra, older files lying around your system collecting disk space.
The FSSTND also means that there is more support from those providing source code packages for you to compile and install yourself. The provider knows, for example, where the executable for sed is to be found on a Linux machine and can use that in his installation scripts or Makefiles. For instance, I've written a package that does just this to generate man pages with correct file references in them before it installs them. If you run a large network, the FSSTND may ease many of your NFS headaches, since it specifically addresses the problems which formerly made shared implementations of /usr impractical.
If you are a distributor, then you will be affected most by the Linux FSSTND. You may have to work a little extra to make sure that your distribution is FSSTND-compliant, but your users (and hence your business) will gain by it. If your system is compliant, third party add-on packages (and possibly your own) will integrate smoothly with your system.
Your users will, of course, gain all the benefits listed above, and many of your support headaches will be eased. You will benefit from all the discussion and thought that has been put into the FSSTND and avoid many of the pitfalls involved in designing a filesystem structure yourself. If you adhere to the FSSTND, you will also be able to take advantage of various features that the FSSTND was designed around. For example, FSSTND makes “live” CD-ROMs containing everything except some of the files in the / and /var directories possible.
If you write documentation for Linux, the FSSTND makes it much easier to do so, which makes sense to the Linux community. You no longer need to worry about the specific location of lock files on one distribution versus another, nor are you forced to write documentation that is only useful to the users of a specific distribution. The FSSTND is at least partly responsible for the recent explosion of Linux books being published.
If you are a developer, the existence of a FSSTND greatly eases many of your headaches. You can know where important system binaries are found, so you can use them from inside your programs or your shell scripts. Supporting users is also greatly eased, since you don't have to worry about things like the location of these binaries when resolving support issues. If you are the developer of a program that needs to integrate with the rest of the system, the FSSTND ensures that you can be certain of the steps to meet this end.
For example, applications such as kermit, which access the serial ports, need to know they can achieve exclusive access to the tty device. The FSSTND specifies a common method of doing this so that all compliant applications can work together. That way you can concentrate on making more great software for Linux instead of worrying about how to detect and deal with the differences in flavors of Linux.
As I've already indicated, the widespread acceptance of the FSSTND by the Linux community has been crucial to the success of both the standard and operating system. Fortunately, nearly every distribution of Linux has been constructed to conform to the the Linux FSSTND. The odds are, if you're running Linux, you are running a FSSTND implementation. If your implementation isn't at least partially FSSTND-compliant, then it is probably either very old or you built it yourself. The FSSTND itself contains a list of some of the distributions that aim to conform to the FSSTND. Be aware, however, that some of these distributions are known to cut some corners in their implementation of FSSTND.
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