Answer Posted / sree ranjini

The file is the basic unit of the UNIX System.There are 3
main categories though in some text books symbolic
links/all special files are splitted and written as
seperate file type(It doesnt matter to whether there are 3
or 4 or 7 file types)

1.Regular files(-) -> includes text files + binary + image
files
2.Directory files(d)
3.Special files
3.1 Device Files
3.11 Character special devices(c)
3.12 Block special devices(b)
3.2 Links
3.21 Hard Links(really not a kind of file but
instead is a second name for a file.Seen as - regular
file type on ls -l)
3.22 Symbolic Link( l )
3.3 Socket(s)
3.4 Fifo ( p )

How to see the file type? simply type ls -l
text,binary are all seen as regular files.How do I get the
type->use file command -> eg $file * lists all file type in
curr dir.

REGULAR FILES( _ )
var/run/syslogd.pid: ASCII text
-rw-r--r-- 1 root root 5 2009-06-19
12:06 /var/run/syslogd.pid

$ile reciprocal
reciprocal: ELF 64-bit LSB executable, x86-64, version 1
(SYSV), for GNU/Linux 2.6.8, dynamically linked (uses
shared libs), not stripped

Directory( d )
/dev/net: directory
drwxr-xr-x 2 root root 60 2009-01-13 20:02 net

/dev/fd: symbolic link to `/proc/self/fd'
lrwxrwxrwx 1 root root 13 2009-06-19 12:06 fd -
> /proc/self/fd

/dev/mem: character special
crw-r----- 1 root kmem 1, 1 2009-06-19 17:35 mem

/dev/loop0: block special
brw-rw---- 1 root disk 7, 0 2009-01-13 20:02 loop0

/dev/log: socket
srw-rw-rw- 1 root root 0 2009-06-19 12:06 log

/dev/initctl: fifo (named pipe)
prw------- 1 root root 0 2009-06-19 12:06
initctl

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