improve check if we are root already - in scripts/get

$EUID is readonly, so it should be save to test against it.

Thanks for the tip @thomastaylor312 !

scripts/get

@@ -50,7 +50,7 @@ initOS() {
 runAsRoot() {
   local CMD="$*"
   
-  if ! whoami | egrep -q '^root$'; then
+  if [ $EUID -ne 0 ]; then
     CMD="sudo $CMD"
   fi