RHEL 6 Hardening with shell scripts

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I'm a Systems Administrator; but I'm new to Shell Scripting. I have a task of hardening quite a number of servers - more than 20. To reduce the work load, I thought of writing shell scripts that would automate most of the things to be done. The organization wants the CIS Benchmark for RHEL 6 to be followed. I wrote 2 scripts, and tried running them. But it seems they are not working. I get the error the following errors:

-bash command not found --when I execute the script with its name. I did the chmod +x

the script runs when I run it with: sh script.sh
but I get these issues:
in /etc/fstab or /etc/tab
usage chkconfig [--list] [--type ] [name] ---shows me usage of chkconfig

Here is my script. what am I doing wrong ?

#!/bin/bash
# Title:    RHEL 6 Hardening
# Author:   Oageng Escobar Baruti
# Date:     24/08/2015
#
# DESCRIPTION: DISABLE / REMOVE / STOP / START / CONFIGURE
#
# Configure File Systems
cp /etc/fstab /etc/fstab.`date +%d%m%Y_%H:%M.%S`
mount -o remount,nodev /tmp
mount -o remount,nosuid /tmp
mount -o remount,noexec /tmp
mount --bind /tmp /var/tmp
mount -o remount,nodev /home
mount -o remount,nodev /dev/shm
mount -o remount,nosuid /dev/shm
mount -o remount,noexec /dev/shm
#
# Disable / Stop Unneccessary Services / Daemons
chkconfig rhnsd off
chkconfig chargen-dgram off
chkconfig chargen-stream off
chkconfig daytime-dgram off
chkconfig daytime-stream off
chkconfig echo-dgram off
chkconfig echo-stream off
chkconfig tcpmux-server off
chkconfig avahi-daemon off
chkconfig cups off
chkconfig nfslock off
chkconfig rpcgssd off
chkconfig rpcbind off
chkconfig rpcidmapd off
chkconfig rpcsvcgssd off
#
#
# Start Important Services
#
#
# Remove Uncessary / Unneeded Packages / Programs
yum erase mcstrans
yum erase telnet-server
yum erase telnet
yum erase rsh-server
yum erase rsh
yum erase ypbind
yum erase ypserv
yum erase tftp
yum erase tftp-server
yum erase talk
yum erase talk-server
yum erase xinetd
yum erase dhcp
yum erase openldap-servers
yum erase openldap-clients
yum erase bind
yum erase vsftpd
yum erase httpd
yum erase dovecot
yum erase samba
yum erase squid
yum erase net-snmp
yum erase setroubleshoot
yum remove xorg-x11-server-common
#
# Configure Networking / Firewalls
#chkconfig iptables on
chkconfig iptables off
chkconfig ip6tables off
#
#
yum install tcp_wrappers
#
OB

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