模拟系统服务

#!/bin/bash
#---------------------------------------------------------------- 
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# 
# File Name:moni.iptables.sh
# Description:Manager iptables 
# author:Guilin Chen
# Date:2018-08-16
#
# Create identity:New 
# Modifying identities:v1.0
# Modify Description:
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if [ $# -eq 0 ];then
    echo "需要传入参数！！！"
    exit
fi
if [ $# -gt 1 ];then
    echo "只需要一个参数即可，我就取前一个，后面的扔垃圾桶了。"
fi
Str=$1
Parameters=("stop" "start" "restart" "status")
Nulls="/dev/null"
ParsCount=${#Parameters[*]}
ParEn=0
for ((i=0;i<$ParsCount;i++))
do
    Pars=${Parameters[$i]}
    if [ $Str == $Pars ];then
        ParEn=1
    fi
done
if [ $ParEn -eq 0 ];then
    echo "参数不合法，仅允许传入：stop， start， restart， status"
    exit
fi

if [ $Str == "stop" ];then
    echo "停用防火墙："
    /etc/init.d/iptables stop
elif [ $Str == "start" ];then
    echo "启动防火墙："
    /etc/init.d/iptables start
elif [ $Str == "restart" ];then
    echo "重启防火墙："
    /etc/init.d/iptables restart
else
    echo "获取防火墙状态："
    /etc/init.d/iptables status
fi