Linux Online - Getting Started with Linux

Getting Started with Linux - Lesson 4

In Linux, everything is a file

Yes, not only is that digital photo of The Eiffel Tower a file but your monitor is a file too! How can that be? Let's try to explain it.

The /dev directory

If you do cd /dev and then ls, you'll see a lot of yellow outlined in black. These are the devices that your system uses or can use. Everything is considered a file in Linux, so your hard disk is kept track of as a file that sits there. If you're using an IDE hard drive (as opposed to SCSI), your hard drive will be known as /dev/hda. Don't delete that, because your hard disk will spin around, come jumping out of your computer, land on the floor and spill out ooze all over the place. No, not really. You will probably not have to look in /dev very much, so don't worry about that.

The /boot directory

Doing: cd /boot will get you into the /boot directory. You will not find any boots or shoes or footwear of any kind there. That's where the Linux kernel usually is. Power users may change the location of the kernel for reasons of their own (they may prefer /shoe), but it is normally placed there on most systems. You will eventually have to use this directory, because you may need to use two or more different types of kernels in the future. That will be taken up in a more advanced lesson.

root's directory - /root

If you are not working as 'root' and you type cd /root, you will be taken to the directory /root. However, you won't be able to do anything while you're there. Root's home directory is a restricted area for everybody else. Linux response is sort of like, 'You don't have to know that'. Users' home directories are under certain restrictions for other users as well.

The /sbin directory

/sbin is another one of those off-limits directories. You may look, but you can't touch. This directory is like /bin in that it has frequently used programs in it, but they're only meant to be used by root. 'Shutdown' is in there. Only root can shutdown the system. If a user other than root tried to shutdown the system, he or she would get a message saying that only root can do that. Then that person would be followed by the secret police for three months.

The /tmp directory

/tmp is a directory that is used to store temporary files, as the name may suggest. You will find later on that when you use a Windows-style system with Linux like KDE, this window manager will create files there for temporary use. When you double click on an icon of a photo, the photo comes up for you to see but a temporary file is created while you're looking at the photo. The temporary file is deleted when you close the KDE image program. It's mainly the programs that work under a windows manager that take advantage of this directory.

The /var directory

/var is a directory for certain files that may change their size (i.e. variable size) For example, there are a few excellent databases for Linux. One is called MySQL. Normally, MySQL keeps its data in a subdirectory of /var called /var/mysql/. If I had an e-commerce website, I would have a database to register purchases. That database would obviously grow in size. And if it didn't then I'd be in trouble. It is also the normal place where email servers store their incoming mail. Again, email varies in size as well.

The /lib directory

/lib is for library files. That's where the name /lib comes from. Programs may use libraries to carry out their functions. Different programs use the same libraries, so Linux will store them here so that every program knows where to find them. You will probably not have to worry about this directory much unless you start getting messages like 'can't find shared library...'. That will sometimes happen when you've downloaded a program and had to compile it yourself from source. Even then, getting what are known as "dependency" problems are quite rare. Most programs, even when compiled from source, usually have a pre-configuration program that makes sure that they can find what libraries they "depend" on to run. If they don't, they'll tell you that you can't install the program.

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