USER SPACE vs ROOT
 

What the difference between both. If I create a script in root, how can I run in user space.

root is a user just with different permissions (i.e all of them) then a regular user.

I think you actually mean kernel space.

https://en.wikipedia.org/wiki/User_space

http://rhelblog.redhat.com/2015/07/2...-kernel-space/

You can create a script as root, then copy it to ~/[username], change the ownership and permissions according, and then [username] can run the script.

If you want all users to have access to it, I suppose you could put in a subdirectory under /opt, also making the correct adjustments to ownership and permissions. A web search isn't helping me out much here, but I did find this: https://serverfault.com/questions/96...r-or-opt/96420

User cannot and, indeed, should not have access to /root. Allowing creates a giant security hole.

or1on, in linux speak, this is userspace:
but i take it that's not what you meant - you mean the definition of an unprivileged, normal user vs. privileged user (usually root).