What is a pseudo-tty?

Question

linux

What is a pseudo-tty? What is its purpose and what is it used for? There is a -T Disable pseudo-terminal allocation
flag in the ssh documentation - is this the same as pseudo-tty?

Answer 1

pseudo-tty - A device that has the functionality of a physical terminal without actually being one. For example xterm. More details manpage pty.
The -T option specifies the connection behavior. If you start ssh with this option, you will disable the pseudo-terminal behavior. Those you will work, as if in direct access. Without command interpreter (bash, zsh). Because of this, some commands and scripts will not work. For example sudo (no tty present and no askpass program specified)
Yes, try this command for more understanding
ssh -t server.com screen -dr pts-2
where screen is a program.

Answer 2

stackoverflow.com/questions/17900760/what-is-pseud...