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Write (save time) Permission set

 
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# 1  
Old 09-07-2013
Tools Write (save time) Permission set
When am saving a file using my username in Linux environment, the file permission granted is rw-r--r--

I have to manually change the permissions using chmod command.

How do i write it to the disk as rw-rw-r while saving my file.
Last edited by Avishek_rc1; 09-07-2013 at 09:28 PM.. Reason: typo
# 2  
Old 09-07-2013
You need to change your umask.

Code:
$ umask  # show the current umask
0022
$ touch z
$ ll z
-rw-r--r--  1 scott  staff  0 Sep  8 03:21 z
$
$ rm z
$
$ umask 0002  # set a new umask
$ touch z   
$ ll z
-rw-rw-r--  1 scott  staff  0 Sep  8 03:21 z

You can save the command (umask 0002) in your ~/.profile, or in your shell's rc file in your home directory.

Note that this only affects new files - it does not update the permissions of existing files - for that you still need to chmod the file.
This User Gave Thanks to Scott For This Post:
Avishek_rc1
# 3  
Old 09-07-2013
Thanks Scott, that was helpful.

I tried it and it worked. The same user account is used by my application too which creates the file.

Now when the application is using the file, it creates the file as rw-r-----

Can you please suggest why the application, when using the same login creates a file with different permission sets.

Appreciate your help on this.
# 4  
Old 09-07-2013
You may need to restart the application to get it to use the new mask.
# 5  
Old 09-07-2013
Thank You.

I have added the script and have restarted the server itself but no luck

This is how my /etc/bashrc looks like (plus additional data..)
Code:
# /etc/bashrc

# System wide functions and aliases
# Environment stuff goes in /etc/profile

# By default, we want this to get set.
# Even for non-interactive, non-login shells.
if [ $UID -gt 99 ] && [ "`id -gn`" = "`id -un`" ]; then
        umask 002
else
        umask 011
fi

Last edited by Scott; 09-07-2013 at 11:36 PM.. Reason: please use code tags
# 6  
Old 09-07-2013
Can you confirm that the umask is properly set before you start the application?

Otherwise it may be that the application is not using the value of umask when it creates files, in which case you may need to find an alternative solution, such as using a cronjob.
# 7  
Old 09-08-2013
The umask sets the default permissions for new files. Applications (processes) can set further restricted permissions in the open() kernel call. Or it can call chmod() afterwards.
If this is the case, you can maybe set the desired permissions in an application preference ...
 
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