hi frds i am currently learning abt the partitions in linux and i used the command what i mentioned in the below please clear my pblms

[root@localhost /]# /dev/sda
bash: /dev/sda: Permission denied
[root@localhost /]# chmod 700 /dev/sda
[root@localhost /]# /dev/sda
bash: /dev/sda: Permission denied
[root@localhost /]# chmod 777 /dev/sda
[root@localhost /]# /dev/sda
bash: /dev/sda: Permission denied
[root@localhost /]#

That's not a command and nothing would be expected to happen. I would have thought you would get 'command not found'.
The chmod command changes permissions on directories/files and you need to be careful with it. If you had actually been able to do a chmod 777 to your whole system, it would have been damaged likely beyond repair. Just saw a post here from someone who did that a week or two ago.

If you want to learn chmod, open a terminal and type: man chmod

There are countless tutorials on Linux permissions and partitions available but if you have a specific question, feel free to post. Also when you post it usually helps to indicate which distribution of Linux you are using as there are hundreds.

hi,

You need to learn Linux Basic, regarding file-system and commands then apply on Linux system.

---
linuxfreakz

First, please read the LQ Rules...you need to spell out your words, and not use text-speak. And you don't have a 'problem' based on what you posted...but if you continue like you're going, you WILL have major problems soon.

You are logged in as root, which is a very, VERY bad idea...more so when you aren't experienced. Second, there are man pages for any linux command...access them by typing in "man <command name>", such as "man chmod", and it will explain what the commands do. You have changed permissions on a device...not a good thing. Programs run...devices don't...so by what you posted, you don't have a problem.