#!/bin/sh#守护进程，接受2个参数#para CMD 执行的命令#pare ID 唯一标识改命令if [ "$1" = "" -o "$2" = "" ];then    echo "USAGE:deamon.sh CMD ID"    exit 100fi #创建文件夹mkdir -p ./varCMD=$1ID=$2#守护循环while [ 1 ]do        #执行命令    $CMD &    echo "`date +'%Y%m%d %H:%M:%S'`\t$CMD Is Start"    #获取进程id并保存    pid="$!"    echo $pid > ./var/$ID.pid    echo "pid is $pid"    wait $pid    echo "`date`\t$CMD Is Stop"    sleep 1done