on-the-fly output redirection, seeing the file redirection output while the program is still running

Question

If I use a command like this one:
./program >> a.txt &
, and the program is a long running one then I can only see the output once the program ended. That means I ha

Answer 1

The unbuffer command from the expect package does exactly what you are looking for.

$ sudo apt-get install expect
$ unbuffer python program.py | cat -