Report and change rootless status.

rootless.sh

#!/bin/bash  
ME=`basename $0`  
IS=$(nvram boot-args | awk '{ print $2 }' | grep rootless | cut -d= -f2)  
if [ $# -lt 1 ]; then  
  if [ "$IS" == "1" ]; then  
    echo "Rootless mode currently active. Use $ME 0 to deactivate."  
  else  
    echo "rootless mode currently inactive. Use $ME 1 to activate."  
  fi  
  exit  
fi  
if [ "$1" == "0" ]; then  
  if [ "$IS" == "1" ]; then  
    sudo nvram boot-args="rootless=0";  
    echo "Rootless mode deactivated. Reboot to apply.";  
  else  
    echo "Rootless mode already inactive. Nothing changed.";  
  fi  
else  
  if [ "$IS" == "0" ]; then  
    sudo nvram boot-args="rootless=1";  
    echo "Rootless mode activated. Reboot to apply.";  
  else  
    echo "Rootless mode already active. Nothing changed.";  
  fi  
fi