Concept of link count in linux Post: 302266862

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Operating Systems Linux Concept of link count in linux Post 302266862 by vaibhav.kanchan on Thursday 11th of December 2008 07:36:00 AM

12-11-2008

Registered User

Concept of link count in linux

Hi All,

Please explain me the concept of link counts when you try to view the contents of any file or directory using ls command.

-sh-3.00$ ls -lrt
total 194
drwxr-xr-x 2 root root 4096 Aug 12 2004 srv
drwxr-xr-x 2 root root 4096 Aug 12 2004 mnt
drwxr-xr-x 2 root root 4096 Aug 12 2004 initrd
drwxr-xr-x 2 root root 4096 Aug 12 2004 home
drwxr-xr-x 2 root root 4096 Aug 24 2005 misc
drwx------ 2 root root 16384 Jun 26 2006 lost+found
drwxr-xr-x 2 root root 4096 Jun 26 2006 selinux
drwxr-xr-x 2 root root 4096 Jun 26 2006 post
drwxr-xr-x 4 root root 1024 Jun 26 2006 boot
drwxr-xr-x 28 root root 4096 Nov 2 2006 var
drwxr-xr-x 18 root root 4096 Feb 15 2008 usr
drwxr-xr-x 12 mqm mqm 4096 Sep 26 12:58 mqm
drwxr-xr-x 35 root root 4096 Nov 20 19:42 opt
dr-xr-xr-x 8570 root root 0 Nov 23 13:53 proc
drwxr-xr-x 9 root root 0 Nov 23 13:53 sys
drwxr-xr-x 9 root root 6100 Nov 23 13:57 dev
drwxr-xr-x 4 root root 4096 Nov 23 13:57 media
drwxr-xr-x 2 root root 4096 Dec 7 04:23 bin
drwxr-xr-x 10 root root 4096 Dec 7 04:23 lib
drwxr-xr-x 2 root root 12288 Dec 7 04:23 sbin
drwxr-x--- 3 root root 4096 Dec 10 04:15 root
drwxr-xr-x 61 root root 12288 Dec 11 04:02 etc
drwxrwxrwt 7 root root 4096 Dec 11 12:24 tmp

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LEARN ABOUT V7

switch_root

SWITCH_ROOT(8)						       System Administration						    SWITCH_ROOT(8)

NAME

       switch_root - switch to another filesystem as the root of the mount tree

SYNOPSIS

       switch_root [-hV]

       switch_root newroot init [arg...]

DESCRIPTION

       switch_root moves already mounted /proc, /dev, /sys and /run to newroot and makes newroot the new root filesystem and starts init process.

       WARNING: switch_root removes recursively all files and directories on the current root filesystem.

OPTIONS

       -h, --help
	      Display help text and exit.

       -V, --version
	      Display version information and exit.

RETURN VALUE

       switch_root returns 0 on success and 1 on failure.

NOTES

       switch_root  will  fail	to  function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet
       this requirement then you can first use a bind-mounting trick to turn any directory into a mount point:

	      mount --bind $DIR $DIR

SEE ALSO

       chroot(2), init(8), mkinitrd(8), mount(8)

AUTHORS

       Peter Jones <pjones@redhat.com>
       Jeremy Katz <katzj@redhat.com>
       Karel Zak <kzak@redhat.com>

AVAILABILITY

       The switch_root command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							     June 2009							    SWITCH_ROOT(8)