cron_ip

#! /bin/bash
logInFile(){
    current_time=`date +%Y.%m.%d-%H:%M:%S`
    # $0指的是当前函数名
    # $1则是第一个参数值 以此类推
    str=$1\\t\\t$current_time
    # 在shell里面的函数，echo一个字符串则是返回值
    echo -e $str >> ~/scripts/old_ip.logs
}
getIp(){
    echo `curl --silent --noproxy ip.sb ip.sb`
}
main(){
    # 利用awk以及sed获取文件最后一行并分割
    lastIp=$(awk --field-separator="\t" '{print $1}' ~/scripts/old_ip.logs | sed -n -e '$p')
    currentIp=$(getIp)
    if [ "$currentIp" == "" ];then
        return 0
    fi
    if [ "$lastIp" != "$currentIp" ];then
        logInFile $currentIp
    fi
}
test(){
    # 读取文件内容放到变量中
    lastIps=$(<~/scripts/old_ip.logs)
    echo $lastIps
    # 一行一行输出文件内容
    while read line;do
        echo $line
    done < ~/scripts/old_ip.logs
    # 获取文件总行数
    echo $(wc -l ~/scripts/old_ip.logs)
    # 获取文件最后一行内容
    lastLine=$(sed -n -e '$p' ~/scripts/old_ip.logs)
    echo $lastLine
}
main