1.修改文件中的IP

$ ./ip.sh '8.8.8.1'

#!/bin/bash # localIP=$(/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6|grep 8|awk '{print $2}'|tr -d "addr:") for ip in $(cat master.json |grep ip |sed 's/:/ /g'|awk '{print$2}' |sed 's/"//g'|sed 's/,//g');do    if [ ${ip} == "1.1.1.1" ]    then      sed -i "s/${ip}/${localIP}/g" master.json     elif [ ${ip} == "1.1.1.2" ]    then      sed -i "s/${ip}/$1/g" master.json    fidone

#!/bin/bashdos2unix agent.jsonmaster=1.1.1.1agent=1.1.1.11for ip in $(cat agent.json |grep ip |sed 's/:/ /g'|awk '{print$2}' |sed 's/"//g'|sed 's/,//g');do    if [ ${ip} == ${master}]    then　　　　echo change master   　　　　sed -i "s/${ip}/$1/g" agent.json     elif [ ${ip} == ${agent} ]    then          echo change agent           sed -i "s/${ip}/$2/g" agent.json    fidone

2.嵌套循环

for file in /home/../*.jsondo    echo "$file:"    for       ...    donedone

 3.判断

for file in /home/.../*    if [ -d "$file" && "$file"=="taskserver" ]    then        echo "$file means localhost is server"        elif [ -d "$file" && "$file" == "taskmaster"]    then        echo ""    elif [ -d "$file" && "$file" == "env_agent"]    then        echo ""    fidone