simple OS check

os_check.sh

#!/bin/bash

if [ $OSTYPE = 'linux-gnu' ]; then
  if [ -f /etc/debian_version ]; then
    DIST=`cat /etc/lsb-release | grep '^DISTRIB_ID' | awk -F=  '{ print $2 }'`
    echo "Debian Stuff"
  elif [ -f /etc/redhat-release ]; then
    DIST=`cat /etc/redhat-release |sed s/\ release.*//`
    echo "Redhat Stuff"
  fi
elif [ `uname` = "Darwin" ]; then
  echo "Mac Stuff"
else 
  echo 'Unsupported OS!';
fi