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Old 01-15-2012, 07:22 AM   #1
TamPepper
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Chmod


I am trying to change permissions of a file on my PVR.
Currently the permissions are 755 and I wish to make it 777
I telnet into the directory and enter the chmod 777 logo.jpg
It returns read-only file system
How can I change this ?
 
Old 01-15-2012, 07:31 AM   #2
MartinStrec
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It looks you've insufficient permissions. Are you logged in as 'root'? Try to switch user by 'su' or 'sudo -i' command. Look who is the file owner (I guess it's 'root').

Do not forget, rights 755 it means full access (read/write/execute) for owner, read/execute for owner group, read/execute for everyone else. The conclusion: you can change rights only if you are owner (or superuser).
 
Old 01-15-2012, 07:46 AM   #3
devUnix
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Have a look at the following commands to understand why you're unable to change the file permissions:

Code:
[test@localhost ~]$ touch /tmp/hi.txt
[test@localhost ~]$ chmod 755 /tmp/hi.txt
[test@localhost ~]$ ls -l /tmp/hi.txt 
-rwxr-xr-x. 1 test test 0 Jan 15 19:14 /tmp/hi.txt
[test@localhost ~]$ logout
[demo@localhost Bash]$ chmod 777 /tmp/hi.txt 
chmod: changing permissions of `/tmp/hi.txt': Operation not permitted
[demo@localhost Bash]$ su - root
Password: 
[root@localhost ~]# chmod 777 /tmp/hi.txt 
[root@localhost ~]# ls -l /tmp/hi.txt 
-rwxrwxrwx. 1 test test 0 Jan 15 19:14 /tmp/hi.txt
[root@localhost ~]#
Note: Only the owner or the Super User i.e. root can change file permissions.
 
Old 01-15-2012, 07:49 AM   #4
repo
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Quote:
It returns read-only file system
Mount it read/write

Kind regards
 
Old 01-15-2012, 08:00 AM   #5
TamPepper
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Can I

Can I do this from telnet on a Windows 7 box ?
 
Old 01-15-2012, 08:18 AM   #6
MartinStrec
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Hi,

your file '/tmp/hi.txt' has been created by user 'test' and it has got rights 755 (rwxr-xr-x).

then you ran command 'chmod' as user 'demo'. User 'demo' is not the owner of '/tmp/hi.txt' so that user cannot change mode (chmod).

For more, I look to the documentation and the chmod is allowed just for file owner or superuser. See 'man chmod'.

Just my idea of changing permissions out of owner is to use 'sudo' command if it's necessary. Even you have to configure it to do not ask passwords in that case.
 
Old 01-15-2012, 09:01 AM   #7
TamPepper
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According to ls -l the file belongs to root and I am logged in as root
 
Old 01-15-2012, 09:06 AM   #8
repo
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Quote:
It returns read-only file system
You are on a read only filesystem.
Mount it read/write.
Quote:
Can I do this from telnet on a Windows 7 box ?
Do you telnet to or from a windows box?

Kind regards
 
Old 01-15-2012, 09:14 AM   #9
TamPepper
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From Windows 7 box to the PVR
 
Old 01-15-2012, 09:17 AM   #10
repo
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Please post the output from
Code:
ls -l
mount
Kind regards
 
Old 01-15-2012, 09:30 AM   #11
TamPepper
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Is there a tenet command for sending the results to a text file on my C drive (Windows)
 
Old 01-15-2012, 09:35 AM   #12
repo
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AFAIK you can't
You could try to copy/paste the output from the terminal.

Kind regards
 
Old 01-15-2012, 09:43 AM   #13
TamPepper
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I "think" I have attached it to this
First ime attempt
Attached Images
File Type: jpg Capture.JPG (52.6 KB, 8 views)
 
Old 01-15-2012, 09:45 AM   #14
vp0619520
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You are on a read only filesystem.
Try this:
Code:
mount -o remount,rw  /dev/partitionname
 
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Old 01-15-2012, 09:57 AM   #15
devUnix
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Quote:
Originally Posted by vp0619520 View Post
You are on a read only filesystem.
Try this:
Code:
mount -o remount,rw  /dev/partitionname
That should work!

Do it as "root".


Code:
[demo@localhost bin]$ touch /media/sf_Books/hello
touch: cannot touch `/media/sf_Books/hello': Read-only file system

[root@localhost ~]# mount -o remount,rw /media/sf_Books/

[demo@localhost bin]$ touch /media/sf_Books/hello
[demo@localhost bin]$ ls -l /media/sf_Books/hello
-rwxrwxrwx. 1 root vboxsf 0 Jan 15 21:25 /media/sf_Books/hello
 
  


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