General :: How To Change The PATH Variable

I was changing my sudoers file to give permission of using "sudo" command to all root commands, asking for the password. It works, it's fine. The problem I'm having is with the variable PATH to my user, I think.

In terminal:
normal user:

Code:

ataias@ataias-notebook:~/Downloads$ echo $PATH
/usr/local/bin:/bin:/usr/bin
super user:

Code:

root@ataias-notebook:~# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/usr/sbin:/bin:/usr/bin

As many commands are in /sbin/, root can use them without writing "/sbin/" but I can't do the same cause it's not in my path.

while root do this:

Code:

shutdown -h now

I should do:

Code:

sudo /sbin/shutdown -h now

and I want to use only

Code:

sudo shutdown -h now

I want to change my user's path variable to make it equal to root's path. how to change it? I don't know many things of shell still.