command info
 

Hello Linux masters,

I have heard about a command. Here it is.

I have searched it on google but didnt got the function of this command.

So finally thought to post it here to get the answer.

I would like to know the function of this command.

Thanks

--bind is not a option of the mount command. What is the command you are trying to research suppose to do ? Also in what context did you hear of it ?

It is on my system...

Arjun;
Enter "man mount" to see an explanation of all the options.

whatever is written in man page that would be only option to use.
use the command,

man mount

Regards
sharad
www.sharadchhetri.com

It says

I still didnt understand about it..


Didnt got info about this command

Google is your friend in these cases, it leeds you to pages like this. ;)

Look here:
http://linux.die.net/man/8/mount

OK , I got it.

The bind mounts.
Since Linux 2.4.0 it is possible to remount part of the file hierarchy somewhere else. The call is

mount --bind olddir newdir .

Bro, can u tell us 2 questions-
(1) what are Old directory and new Directory name.
(2) Why your trying to mount in /home/userid ;(if the /home/userid is already mounted, u can not mount)

Paste the error here.

Nice tutorial in the link

Thanks for this

Can you tell me if it is possible to mount the directory of a user group to another user group directory ?

like

I just practically done this "mount --bind" option.
U can check this out in my blog.I have embedded the youtube video.

http://sharadchhetri.com/2012/07/15/...-ubuntu-12-04/

y-dont-tube
 

Videos are neat, but my corporate laptop and network are pre-configured to block video streaming to reduce network impact on production. If your information is not available as text, it might just as well not exist for a significant segment of the community.

Here I am mounting one .iso file .
This is a brief step by step. (/opt/test = old_dir and /opt/newtest = new_dir)



root@tuxworld:/# ls -l /opt/test/
total 0
root@tuxworld:/# ls -ld /opt/test/
drwxr-xr-x 2 root root 4096 Jul 15 17:15 /opt/test/
root@tuxworld:/#
root@tuxworld:/# mkdir /opt/newtest
root@tuxworld:/#
root@tuxworld:/# mount -o loop /root/CentOS6.3.iso /opt/test/
mount: warning: /opt/test/ seems to be mounted read-only.
root@tuxworld:/# ls /opt/test/
CentOS_BuildTag Packages RPM-GPG-KEY-CentOS-Security-6
EULA RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Testing-6
GPL repodata TRANS.TBL
images RPM-GPG-KEY-CentOS-6
isolinux RPM-GPG-KEY-CentOS-Debug-6
root@tuxworld:/#

root@tuxworld:/# mount --bind /opt/test/ /opt/newtest
mount: warning: /opt/newtest seems to be mounted read-only.
root@tuxworld:/#
root@tuxworld:/# ls /opt/newtest
CentOS_BuildTag Packages RPM-GPG-KEY-CentOS-Security-6
EULA RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Testing-6
GPL repodata TRANS.TBL
images RPM-GPG-KEY-CentOS-6
isolinux RPM-GPG-KEY-CentOS-Debug-6
root@tuxworld:/#
root@tuxworld:/#
root@tuxworld:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 28G 25G 2.2G 93% /
udev 2.0G 4.0K 2.0G 1% /dev
tmpfs 794M 884K 793M 1% /run
none 5.0M 4.0K 5.0M 1% /run/lock
none 2.0G 332K 2.0G 1% /run/shm
/dev/sda7 9.3G 1.2G 7.7G 14% /partition7
/dev/loop0 3.5G 3.5G 0 100% /opt/test
root@tuxworld:/#

Match the last output. You can understand what actually --bind do.

root@tuxworld:/# ls -l /opt/test/
total 528
-r--r--r-- 2 root root 14 Jul 7 14:11 CentOS_BuildTag
-r--r--r-- 2 root root 212 Jul 2 01:51 EULA
-r--r--r-- 2 root root 18009 Jul 2 01:51 GPL
dr-xr-xr-x 3 root root 2048 Jul 6 01:27 images
dr-xr-xr-x 2 root root 2048 Jul 6 01:26 isolinux
dr-xr-xr-x 2 root root 499712 Jul 7 14:13 Packages
-r--r--r-- 2 root root 1354 Jul 2 01:51 RELEASE-NOTES-en-US.html
dr-xr-xr-x 2 root root 4096 Jul 7 14:15 repodata
-r--r--r-- 2 root root 1706 Jul 2 01:51 RPM-GPG-KEY-CentOS-6
-r--r--r-- 2 root root 1730 Jul 2 01:51 RPM-GPG-KEY-CentOS-Debug-6
-r--r--r-- 2 root root 1730 Jul 2 01:51 RPM-GPG-KEY-CentOS-Security-6
-r--r--r-- 2 root root 1734 Jul 2 01:51 RPM-GPG-KEY-CentOS-Testing-6
-r--r--r-- 1 root root 3165 Jul 7 14:15 TRANS.TBL
root@tuxworld:/#
root@tuxworld:/# ls -l /opt/newtest/
total 528
-r--r--r-- 2 root root 14 Jul 7 14:11 CentOS_BuildTag
-r--r--r-- 2 root root 212 Jul 2 01:51 EULA
-r--r--r-- 2 root root 18009 Jul 2 01:51 GPL
dr-xr-xr-x 3 root root 2048 Jul 6 01:27 images
dr-xr-xr-x 2 root root 2048 Jul 6 01:26 isolinux
dr-xr-xr-x 2 root root 499712 Jul 7 14:13 Packages
-r--r--r-- 2 root root 1354 Jul 2 01:51 RELEASE-NOTES-en-US.html
dr-xr-xr-x 2 root root 4096 Jul 7 14:15 repodata
-r--r--r-- 2 root root 1706 Jul 2 01:51 RPM-GPG-KEY-CentOS-6
-r--r--r-- 2 root root 1730 Jul 2 01:51 RPM-GPG-KEY-CentOS-Debug-6
-r--r--r-- 2 root root 1730 Jul 2 01:51 RPM-GPG-KEY-CentOS-Security-6
-r--r--r-- 2 root root 1734 Jul 2 01:51 RPM-GPG-KEY-CentOS-Testing-6
-r--r--r-- 1 root root 3165 Jul 7 14:15 TRANS.TBL
root@tuxworld:/#

OK, got it

But, will it work with a non-root or with a normal user?

No, root permission is required. Try yourself it will show the message.