shell 守护进程

#!/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
fi 

#创建文件夹
mkdir -p ./var
CMD=$
ID=$

#守护循环
while [  ]
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
done