On my server I have a directory called /data and when I am logged in as root, I normally create a new directory in /data/.

My problem is right now as root in /data, when I mkdir <whatever>, the permissions are not what I want on the new directory. Is there a way to set up this server to apply specific permissions to a new directory?

Right now when I run the mkdir command, this is what I get by default:

Then I normally do the following to correct the permissions I don't like.

This now fixes the new directory and files under /data but is there a way I can avoid this and have all my newly created directories be 770 and throw a sticky bit on the group permission so when someone creates anything under that directory, the group will always be "admin"?

I think you can achieve this by setting global umask value.

Does "global" umask allow you to set it at a specific subdirectory or is it global for the / dir and everything under?

The umask is global. I'm not aware of any way to make it apply to only one particular directory. You could always do

mkdir -m 2770 /data/whatever

to make the directory and set the permissions in one step.

So how does one set the global umask if I want newly future directories to -drwxrwx--- or 770?