Floppy Drive

/dev/fd0

SCSI CD-Rom
Drive

/dev/scd0

IDE CD-ROM
Drive

/dev/hdc (if the drive is the master IDE device on the
secondary IDE channel in the system)

Serial
Port

/dev/ttyS0

Parallel
Port

/dev/lp0

/etc/fstab

Lists the partitions and file systems that will be
automatically mounted when the system boots.

/etc/group

Contains local group definitions.

/etc/grub.conf

Contains configuration parameters for the GRUB bootloader
(assuming it’s being used on the system).

/etc/hosts

Contains a list of hostname-to-IP address mappings the
system can use to resolve hostnames.

/etc/inittab

Contains configuration parameters for the init process.

/etc/init.d/

A subdirectory that contains startup scripts for services
installed on the system. On a Fedora or Red Hat system, these are located in
/etc/rc.d/init.d.

/etc/modules.conf

Contains configuration parameters for your kernel modules.

/etc/passwd

Contains your system user accounts.

/etc/shadow

Contains encrypted passwords for your user accounts.

/etc/X11/

Contains configuration files for X Windows.

Regular Files

These files are similar to those used by the file systems
of other operating systems–for example, executable files, OpenOffice.org
files, images, text configuration files, etc.

Links

These files are pointers that point to other files in the
file system.

FIFO’s

FIFO stands for First In First Out. These are special
files used to move data from one running process on the system to another. A
FIFO file is basically a queue where the first chunk of data added to the
queue is the first chunk of data removed from the queue. Data can only move
in one direction through a FIFO.

Sockets

Sockets are similar to FIFOs in that they are used to
transfer information between sockets. With a socket, however, data can move
bi-directionally.