I don’t actually need to run the command below, and I am aware of ssh keys if I did want to log in without typing a password. I would just like to know how
ssh seems to circumvent my file redirection.
Running the following command,
ssh prompts me for a password:
ssh email@example.com > /dev/null 2> /dev/null < /dev/null
How does this work?
stderr are all redirected, but
ssh still manages to print a prompt on my screen and read what I type. I tried adding the
-t -t and
-T (not both at once), to enable or disable pseudo-tty allocation, but it made no difference.
I also tried closing all input and output this way, although I don’t know if I typed it correctly. Still,
ssh prompts for a password:
(exec 0<&- 1<&- 2<&- 0>&- 1>&- 2>&-; ssh firstname.lastname@example.org)