Suppress Output Of Subprocess

I want to use the subprocess module to control some processes spawned via ssh. By searching and testing I found that this works: import subprocess import os import time node = 'gu

Solution 1:

Ok, the output is now clear. I do not exactly know why, but the command ssh -t -t puts the local terminal in raw mode. It makes sense anyway, because it is intended to allow you to directly use curses programs (such as vi) on the remote, and in that case, no conversion should be done, not even the simple \n -> \r\n that allows a simple new line to leave the cursor on first column. But I could not find a reference on this in ssh documentation.

It (-t -t) allows you to kill the remote process because the raw mode let the Ctrl + C to be sent to the remote instead of being processed by the local tty driver.

IMHO, this is design smell, because you only use a side effect of the pty allocation to pass a Ctrl + C to the remote and you suffer for another side effect which is the raw mode on local system. You should rather process the standard input (stdinput = subprocess.PIPE) and explicitely send a chr(3) when you input a special character on local keyboard, or install a signal handler for SIG-INT that does it.

Alternatively, as a workaround, you can simply use something like os.system("stty opost -igncr") (or better its subprocess equivalent) after starting the remote command to reset the local terminal in an acceptable mode.