crontab -e

　　* * * * * /bin/date >>/tmp/date.txt

　　* * * * * sleep 10s; /bin/date >>/tmp/date.txt   //暂停10秒后执行命令

　　* * * * * sleep 20s; /bin/date >>/tmp/date.txt

　　* * * * * sleep 30s; /bin/date >>/tmp/date.txt

　　* * * * * sleep 40s; /bin/date >>/tmp/date.txt

　　* * * * * sleep 50s; /bin/date >>/tmp/date.txt

当然sleep的单位也有分，时，天

分别是 m , h , d

sleep 40m;

sleep 40h;

sleep 40d;