I have a bash script that starts with this:

if [[ $EUID -ne 0 ]]; then
    echo "Permission denied (are you root?)."
    exit 1
elif [ $# -ne 1 ]
then
    echo "Usage: install-nfs-server <client network/CIDR>"
    echo "$ bash install-nfs-server 192.168.1.1/24"
    exit 2
fi;

I then try to add the iptables rules for NFS as follows:

iptables -A INPUT -i eth0 -p tcp -s $1 --dport 111 -m state --state NEW,ESTABLISHED -j ACCEPT
    iptables -A OUTPUT -o eth0 -p tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT
    iptables -A INPUT -i eth0 -p udp -s $1 --dport 111 -m state --state NEW,ESTABLISHED -j ACCEPT
    iptables -A OUTPUT -o eth0 -p udp --sport 111 -m state --state ESTABLISHED -j ACCEPT
    service iptables save
    service iptables restart

I get the error:

Try iptables -h' or 'iptables --help' for more information. Bad argument111' Try iptables -h' or 'iptables --help' for more information. Bad argument111' Saving firewall rules to /etc/sysconfig/iptables: ^[[60G[^[[0;32m OK ^[[0;39m]^M Flushing firewall rules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Setting chains to policy ACCEPT: filter ^[[60G[^[[0;32m OK ^[[0;39m]^M Unloading iptables modules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Applying iptables firewall rules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Loading additional iptables modules: ip_conntrack_netbios_ns ^[[60G[^[[0;32m OK ^[[0;39m]^M

When I open /etc/sysconfig/iptables these are the rules:

 # Generated by iptables-save v1.3.5 on Mon Mar 26 08:00:42 2012
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [466:54208]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A OUTPUT -o eth0 -p tcp -m tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT
-A OUTPUT -o eth0 -p udp -m udp --sport 111 -m state --state ESTABLISHED -j ACCEPT
-A OUTPUT -o eth0 -p tcp -m tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT
-A OUTPUT -o eth0 -p udp -m udp --sport 111 -m state --state ESTABLISHED -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p esp -j ACCEPT
-A RH-Firewall-1-INPUT -p ah -j ACCEPT
-A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Mon Mar 26 08:00:42 2012
~
"/etc/sysconfig/iptables" 32L, 1872C

I've also tried:

iptables -I RH-Firewall-1-INPUT 1 -m state --state NEW -m tcp -p tcp --source $1 --dport 111 -j ACCEPT
iptables -I RH-Firewall-1-INPUT 2 -m udp -p udp --source $1 --dport 111 -j ACCEPT