nohup python3 -u botxiaohui.py >> botruninfo.log 2 >&1 &
>> 是追加的输出
> 单行，则覆盖输出
>> 是追加的输出 如果是单行，则覆盖输出
nohup python3 -u botxiaohui.py >> botruninfo.log 2 >&1 &
> > is the additional output if it is a single line, covering the output
nohup command > out.out 2>&1 &