Small daught

[Deepak Kulkarni]

Hi All,

Why directories has 777 and files are having 666 permission.

Regards
Deepak

[Rajesh SB]

Hi,

Which directories and files permission are your talking about?
Give more details.

Regards,
RAjesh

[Pedro Cirne]

Hi,

The files created have their permissions default set by the command umask. Check the man pages of umask for details.

Enjoy :)

Pedro

[Simon Hargrave]

Do you ask of a particular file, or in general?

In general: -

777 on a directory means anyone can read, write and search the directory. (the execute bit on a directory means you can see the contents of the directory).

666 on a file means everyone can read and write the files.

[Deepak Kulkarni]

Thanks for the response.

I mean why directories will have rwxrwxrwx and why files will have rw-rw-rw in generel

Thanks
Deepak

[Rajesh SB]

Hi Deepak,

The effective file permissions are depends on the umask setting.
Typically used umask is 022.


Regards,
Rajesh

[Rajesh SB]

Hi Deepak,

This recent disscussed link may help you for your doubts.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=123778

Regards,
Rajesh

PS:Don't forget to give points.

[Deepak Kulkarni]

Hi Simon,

Why files will not be having 777 i.e rwxrwxrwx permissions?

Regards
Deepak

[Juan Manuel López]

Hi.
The x permision allow access to directory instead the rw on files permit to read an write that files, not execute it.
I Hope This Help You.
Juanma

[MarkSyder]

The x permissions on a file are execute - these will only apply to program files (e.g. shell scripts). Text files do not need execute permission.

Mark Syder (like the drink but spelt different)

[Deepak Kulkarni]

thanks to all

[Simon Hargrave]

the "x" permission on a file is only useful if it is executable, ie it is a shell script, perl, binary program etc. if the file is data, text, source code etc there is no reason to have the "x" permission set on a file.

I should also note that in general, unless absolutely neccessary you should avoid having files with full worlds writability (rw-rw-rw-). You should aim for rw-rw-r-- at least, depending on your application.

umask as others have mentioned is used to set the default permissions mask for new files. I would recommend you read the man page thoroughly to understand it. It can be a strange one to understand if you're new to it, but it is very important in maintaining a secure system.

[Leif Halvarsson_2]

Hi,
files can can 777 permissions as well but the behaviour is different.

try the following:

create a simple file containing the command "ls -l".

set permissions to 666.
chmod 666 yourfile
try ./yourfile (you will get an error)
chmod 777 yourfile
try again ./yourfile (the command ls -l is executed)