Pseudoterminal Is a pair pseudo-devices that we need to use, if we're implementing a terminal emulator.
There are two devices: ~master~ and ~slave~. Both connected together.
The ~master~ connected to the user's side (terminal emulator), to read the user's input and display information, since the ~slave~ connected to the client (such as bash or shell).
In BSD systems, the files are:
- master: /dev/pty* - slave: /dev/tty*
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