chmod +X
For those that already know well how to change permissions, this memo won’t be usefull.
Maybe, it can be usefull to some others.
umask is generally fixed to 022.
This mask will be applied every times you create files and directories.
For directories, umask will be combinated with max permissions 0777 :
0777 - 022 = 755 (rwxr-xr-x)
For files, umask will be combinated with 0666 :
0666 - 022 = 644 (rw-r—r—)
You can change umask() value for 1 user or the whole system.
But, sometimes, you don’t want to do that and need to set permissions for only 1 directory.
example :
Suppose you (leader of a project) have 1 directory with normal 755.
Now, you want to share it with your team, you want to put it in some share.
On the share, now you want 750 for directories and 640 for files.
So you start with something like this :
drwxr-xr-x leader team 15 oct. 2009 /some/common/directory
You want : group (team) to be able to read files and directories above /some/common/directory
By doing : chmod -R g+r /some/common/directory
All files will be readable by group (team).
But the bad is that directories need ‘x’ bit to be accessed.
If you do : chmod -R g+x /some/common/directory
You’ll set ‘x’ for files and directories.
Before starting to write a script based on `find -type d`, have a look at `chmod +X` (X in capital) will ask chmod to set ‘x’ only where needed.
It will set ‘x’ only for directories.
So, for our case, something like this :
chmod -R go-rx /some/common/directory
chmod -R g+rX /some/common/directory
