Unbreakable Linux Enviroment check before R12 install

This script collects and shows the data that is required by the R12 Release Notes in 'Oracle Applications Installation and Upgrade Notes Release 12 (12.0) for Linux (32-bit)' without having to run RapidWizard.

#!/bin/bash
clear
echo "============================================"
echo "Script to check Unbreakable Linux enviroment"
echo "============================================"
echo
echo "---------------------------------------------------"
echo "From /etc/redhat-release:-"
echo "---------------------------------------------------"
cat /etc/redhat-release 2>&1
echo "---------------------------------------------------"
echo
echo "---------------------------------------------------"
echo "From /etc/hosts"
echo "---------------------------------------------------"
cat /etc/hosts 2>&1
echo "---------------------------------------------------"
echo
echo "From /etc/sysconfig/network"
echo "---------------------------------------------------"
cat /etc/sysconfig/network 2>&1
echo "---------------------------------------------------"
echo
echo "---------------------------------------------------"
echo "/etc/sysconfig/networking/profiles/default/network"
echo "THIS FILE SHOULD NOT EXIST"
echo "---------------------------------------------------"
cat /etc/sysconfig/networking/profiles/default/network 2>&1
echo "---------------------------------------------------"
echo
echo "---------------------------------------------------"
echo "uname -r"
echo "This must be greater than 2.6.9-42.0.0.0.1.EL"
echo "---------------------------------------------------"
uname -r
echo
echo "---------------------------------------------------"
echo "Check tools exist"
echo "---------------------------------------------------"
echo
which ar
which gcc
which g++
which ld
which ksh
which make
echo
echo "---------------------------------------------------"
echo "Query package version"
echo "---------------------------------------------------"
rpm -qa grep glibc
rpm -qa grep binutils
rpm -qa grep gcc
rpm -qa grep libgcc
rpm -qa grep libstdc
rpm -qa grep pdksh
rpm -qa grep make
rpm -qa grep gnome-libs
rpm -qa grep sysstat
rpm -qa grep compat-db
rpm -qa grep openmotif
rpm -qa grep setarch
rpm -qa grep control-center
rpm -qa grep xscreensaver
rpm -qa grep libaio
echo
echo "---------------------------------------------------"
echo " From /etc/sysctl.conf:- "
echo "---------------------------------------------------"
cat /etc/sysctl.conf 2>&1
echo
echo "---------------------------------------------------"
echo " From /etc/security/limits.conf"
echo "---------------------------------------------------"
echo
cat /etc/security/limits.conf 2>&1
echo
echo "---------------------------------------------------"
echo
echo "---------------------------------------------------"
echo "From /etc/resolv.conf"
echo "---------------------------------------------------"
cat /etc/resolv.conf 2>&1
echo
echo "---------------------------------------------------"
echo " THE END"
echo "---------------------------------------------------"