$(date "+%H%M%S")

date "+%Y%m%d"

nohup sh pi.sh > p.txt &

#!/bin/bash

while [ "$hsl" != "Fri Jan 22 22:25:50 CST 2021" ]

do

hsl=`date`

sleep 1

echo `date`

done

echo "lu?dan gei lou"

#nohup和&不一樣的地方就是：&關(guān)了終端就斷開了?