初见shell，写一个设置网卡参数的脚本试一下。效率很低，但是凑合用了。

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#!/bin/bash
LANG=zh_CN.UTF-8

clear #Select the network card

echo "`date`"
echo -e "\033[34m Select Network card(Enter to continue)\033[0m"
ceshi=$(find /etc/sysconfig/network-scripts/ -name ‘*ifcfg*‘)

#Segmentation variables data
OLD_IFS="$IFS"
IFS=" "
arr=($ceshi)
IFS="$OLD_IFS"

i=0  #Definitions and variables
for s in ${arr[@]}   #for
do
#    echo "$s"   
#    echo "--"   
    conid[i]=$s
    echo "No." $i "Network card:" $s
    ((i++))
done

# echo ${conid[0]}
# echo ${conid[1]}

#echo ${#conid[*]}  #pinrt conid[*]

#检测用户选择网卡
echo -e "\033[34m Select Network card No.: \033[0m"

read conidNum   #user in
#echo $conidNum

clear #onboot

echo -e "\033[34m You select No. $conidNum   Network card：${conid[$conidNum]} \033[0m"

echo "You want to boot with this card(ONBOOT)："
echo -e "1.ONBOOT=\033[33m YES \033[0m"
echo -e "2.ONBOOT=\033[33m NO \033[0m"
echo "Enter 1 or 2 ："
read onboot
case $onboot in
    1)
    onboottxt="YES"
    ;;
    2)
    onboottxt="NO"
    ;;
esac

clear #Bootproto

echo -e "\033[34m You select No. $conidNum   Network card：${conid[$conidNum]} \033[0m"
echo -e "\033[34m Boot with this card $onboottxt 。(ONBOOT=${onboottxt}) \033[0m"

echo "Select network mode (BOOTPROTO)："
echo -e "1.BOOTPROTO=\033[33m STATIC \033[0m"
echo -e "2.BOOTPROTO=\033[33m DHCP \033[0m"
echo "Enter 1 or 2 ："
read bproto
case $bproto in
    1)
    bprototxt="STATIC"
    ;;
    2)
    bprototxt="DHCP"
    echo "Any key to Finish，Ctrl+c to Exit 。"
    read -n 1

    sed -i ‘/ONBOOT/d‘ ${conid[$conidNum]}
    sed -i ‘/BOOTPROTO/d‘ ${conid[$conidNum]}

    echo "ONBOOT="$onboottxt >>${conid[$conidNum]}
    echo "BOOTPROTO="$bprototxt >>${conid[$conidNum]}

    #del old config

    sed -i ‘/IPADDR/d‘ ${conid[$conidNum]}
    sed -i ‘/NETMASK/d‘ ${conid[$conidNum]}
    sed -i ‘/GATEWAY/d‘ ${conid[$conidNum]}
    sed -i ‘/DNS1/d‘ ${conid[$conidNum]}
    sed -i ‘/DNS2/d‘ ${conid[$conidNum]}

    echo "Modifications are complete！！！  service reatst。。"

    service network restart
    #service network restart
    echo "-------Print ifconfig-------"
    ifconfig
    echo "-------Print ifconfig-------"

#echo ${conid[$conidNum]}

    echo "Any key to Exit。"
    read -n 1
    exit
    ;;
esac

clear #IPADDR

echo -e "\033[34m You select No. $conidNum   Network card：${conid[$conidNum]} \033[0m"
echo -e "\033[34m Boot with this card $onboottxt 。(ONBOOT=${onboottxt}) \033[0m"
echo -e "\033[34m The network mode  $bprototxt。(BOOTPROTO=${bprototxt}) \033[0m"

echo "Plase enter IP Address："
read ipaddr
echo "Plase enter NetMask："
read netmask
echo "Plase enter GateWay："
read gateway
echo "Plase enter NDS Main："
read dns1
echo "Plase enter NDS Alternate(Enter to Default configuration)："
read dns2

echo "Plase check the configuration，Enter to Finish or Ctrl+c to Exit。"

#echo ${conid[$conidNum]}

#del old config

    sed -i ‘/ONBOOT/d‘ ${conid[$conidNum]}
    sed -i ‘/BOOTPROTO/d‘ ${conid[$conidNum]}
    sed -i ‘/IPADDR/d‘ ${conid[$conidNum]}
    sed -i ‘/NETMASK/d‘ ${conid[$conidNum]}
    sed -i ‘/GATEWAY/d‘ ${conid[$conidNum]}
    sed -i ‘/DNS1/d‘ ${conid[$conidNum]}
    sed -i ‘/DNS2/d‘ ${conid[$conidNum]}
    

#add new config

    echo "ONBOOT="$onboottxt >>${conid[$conidNum]}
    echo "BOOTPROTO="$bprototxt >>${conid[$conidNum]}
    echo "IPADDR="$ipaddr >>${conid[$conidNum]}
    echo "NETMASK="$netmask >>${conid[$conidNum]}
    echo "GATEWAY="$gateway >>${conid[$conidNum]}
    echo "DNS1="$dns1 >>${conid[$conidNum]}
    if test -z "$dns2"
    then
    $dns2="Null"
    else
    echo "DNS2="$dns2 >>${conid[$conidNum]}  
    fi

    #echo "已完成修改！！！  正在重启服务。。"
    echo "Modifications are complete！！！  service reatst。。"

    #service network restart
    service network restart
    echo "-------Print ifconfig-------"
    ifconfig
    echo "-------Print ifconfig-------"

    #echo "任意键退出。"
    echo "Any key to Exit。"
    read -n 1
    exit

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后记：能够3行解决的问题写了好多好多的行。在centos6.5上跑了一下，能够满足需求。第一次写shell脚本，才发现原来英文信息才是“最简单的”。

初见shell，设置网卡参数