Change permission to 755

[Chui Kock You_1]

Hi,

I want change from


[lpctst1]/usr2 # ll
total 0
lrwx------ 1 root sys 6 Feb 22 19:48 uv -> /db/uv

to

[lonpacdr]/usr2 #ll
total 6
drwxrwxr-x 8 root sys 1024 Oct 11 15:10 SBplus
drwxrwxr-x 8 root sys 1024 May 14 2010 SBplus.111010
drwxr-xr-x 2 root root 96 Jan 5 2007 lost+found
drwxrwxr-x 8 root sys 1024 Oct 11 15:10 lp.new
lrwxrwxrwx 1 root sys 6 Nov 10 2008 uv -> /db/uv

What is the command line to change the /db/uv file permission to 755? Any idea.

Regards,
Chui

[Manix · Accepted solution]

chmod 755 file_name is the method is itnot working for you ?

Thanks
Manix

[nijokj]

In your case /db/uv is the original file and /usr2/uv is the symbolic link.
If you want to change permission of link only use
chmod -h 755 /db/uv

[Chui Kock You_1]

Hi Manix,

I've try the chmod 755. Is not working. I want to change the symbolic link file not the source file.

Regards,
Chui

[nijokj]

have you tried
lchmod 755 symlinkfile

[nijokj]

This thread explaining the use of lchmod.

http://h30499.www3.hp.com/t5/System-Administration/How-to-create-symbolic-link-permission-of-lr-r-r-T/m-p/3068771#M140156

[Dennis Handly]

>What is the command line to change the /db/uv file permission to 755?

The permissions on a symlink don't really matter.
While there is a command to change the ownership of the symlink, there isn't for the permissions.

[Chui Kock You_1]

Hi Dennis,

What is the command to change the ownership of the symbolic link?

Regards,
Chui

[nijokj]

The command is
chown -h own:grp symbolic link
The below url for reference.
http://docs.hp.com/en/B2355-90680/chown.1.html

[Chui Kock You_1]

Hi Nijoki,

Can i used the command umask 000 to change from

[lpctst1]/usr2 # ll
total 0
lrwx------ 1 root sys 6 Feb 22 19:48 uv -> /db/uv

to

[lonpacdr]/usr2 #ll
total 6
lrwxrwxrwx 1 root sys 6 Nov 10 2008 uv -> /db/uv

Regards,
Chui

[Jose Mosquera]

Hi,

The umask mask command sets a new file mode creation mask **for the current shell execution environment**.
In your case you are setting **whole** file creation for your active session to 777 file mode, this is very risky concerning system security.
Please carefully read the documentation about:
#man umask

Security practices suggest an umask 022 mode.

Rgds.

[Manix]

As Jose said , don`t change umask for the sake of single file.

Thanks
Manix

[Chui Kock You_1]

Hi Manix,

I've done that on the umask command. It won't corrupt the file. What is the different between the lchmod and the umask? Any manual.

Regards,
Chui

[Manix]

lchmod is a system call to change link permission , not a standard command.

Looks at what Clay stated.

The system call chmod() follows the symbolic link and thus does not operate on the symbolic link directly. Similarly, the symlink() system call does not allow a mode argument so that don't work neither. However, there is an UNDOCUMENTED system call, lchmod(), that does operate directly on the symbolic link.


umask - set or display the file mode creation mask.

The mask affects the initial value of the
file mode (permission) bits for subsequently created files.

So umask sets the default file permissions.

[Chui Kock You_1]

Hi Guru,

Thanks for the help.

Regards,
Chui

[Dennis Handly]

>Can I used the command umask 000 to change from

Only if you remove then recreate the symlink.
Since you only want to change umask for this one file, you may want to put this in a script so the old umask is restored.