linux terminal: how to copy output to a file and print at terminal simultaneously?

Question

I would like to save output from command to a file and observe it on ubuntu terminal at once.

Using basic:

command >output.txt

It's not working, because the terminal shows nothing.

Is it possible to see the output in both file and in terminal window?

Answer 1

使用tee命令可以实现相同的目的。

command | tee output.txt