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In some operating systems, including Unix and Linux, a pseudoterminal, pseudotty, or PTY is a pair of pseudo-device endpoints (files) which establish asynchronous, bidirectional communication (IPC) channel (with two ports) between two or more processes. The master provides means by which a terminal emulator process controls the slave. The slave, emulates a hardware text terminal device. PTY are similar to bidirectional pipes.
The master files are typically used by networking applications (e.g. rlogin) and slave files are used by terminal-oriented programs such as shells (e.g. bash) as a processes to read/write data back from/to master endpoint. Common application of PTYs is in providing network login services.
Devpts is a Linux Kernel virtual file system used to emulate PTYs connection.
Linux implementation is based on System V-style terminals (commonly referred as UNIX 98 pseudoterminals) and provides POSIX and the Single Unix Specification API in the form of a posix_openpt() function since 1998.
Unix tty
command is typically used to get PTY file path connected to the current standard input.