I want to save the terminal output as a file and also see the output immediately. There are a lot of related questions but the answers are not satisfying. For example,

my_command > output.txt

does not print output to terminal. Another answer, which is

my_command | tee output.txt

prints output to terminal after the process is completed, not immediately. Although I can append each line when I print the output in python code, but this does not seem to be a right way to solve issue.

Update: it seems that tee flushes output to terminal with certain amount of units.

CodePudding user response：

Here's a solution that only works for python scripts. Whenever the script prints something on terminal with print function, instead of

print("some message")

use

print("some message", flush=True)

and with the shell command

$ python3 my_script.py |& tee output.txt

it worked well.

CodePudding user response：

You can use stdfbuf to modify the buffering behavior of the standard streams of a command. Something like

stdbuf -o0 your_command | stdbuf -i0 -o0 tee

should get rid of the buffering.

Note, this does not work for commands that override the buffering settings of their standard streams, see also this post.