Provide a way to run conda run w/o buffering stdout (and output in general)

[brettcannon]

Currently conda run buffers everything going to stdout (I didn't test stderr). It would be great to be able to get streaming results from the running command rather than having to wait until the application exits.

[msarahan]

Yes, this would be a big improvement. I've looked at ways to "tee" this output, but it ended up being too deep of a rabbit hole at the time. If you have any recommendations for how to achieve this, please let us know.

[mingwandroid]

conda-run also misses any way to handle stdin. IMHO a thread should be launched for all the IO.

[brettcannon]

Does conda run do anything after the process exits? Could conda run use a os.exec*() function to substitute the conda process for the Python process in-place so that stdout and friends aren't buffered because Python now owns stdout and friends?

[earhart]

FWIW -- as a workaround, I've noticed that using "conda run -n my_env bash -c 'my_actual_command > /dev/tty 2>&1'" seems to work on Linux (and should work fine on any Posix system).

[jcmuel]

For those who need something similar to an unbuffered version of "conda run": The new --no-capture-output option (#9646) in conda 4.9.0 (see CHANGELOG) has a similar effect and solves the problem for me.

conda run --no-capture-output python3 -u -c $'import time;\nfor x in range(0, 9): print(0); time.sleep(.5)'

[kalindkaria]

Thank you for this update! It saved a lot of my time.

[kenodegard]

Confirming this is addressed with the --no-capture-output argument.