#!/bin/sh

ROOT_UID=0      # Only users with $UID 0 have root privileges.
E_NOTROOT=67    # Non-root exit error.

# Run as root, of course.
if [ "$UID" -ne "$ROOT_UID" ]; then
  echo "Must be root to run this script."
  exit $E_NOTROOT
fi

df -h / 2>/dev/null
df -h /var 2>/dev/null
df -h /home 2>/dev/null
du -ks /* | sort -n | tail -n 15
du -ks /var/* | sort -n | tail -n 15