Note that, /dev/tty is the synonym of the terminal run at current time.
There are usually 3 demands:
when I execute a python script
python script.py
1.output the result to the file script.log
python script.py |tee script.log
Then the output in screen is unchanged, but additionally be copied to the script.log as well.
2：output the both standard output and error to the file script.log with screen output unchanged.
python class.py 2>&1 | tee script.log
3：only pip the output into script.log, without show on the screen.
python class.py 2>&1 | tee >script.log
or
python class.py | tee >script.log
