Stty

Stty is a command-line utility on Unix-like operating systems that allows a user to view and configure the terminal line settings associated with a terminal device. It interfaces with the system’s terminal driver, typically via the termios API, to control input and output characteristics such as baud rate, character size, parity, stop bits, and flow control, as well as the terminal’s special characters (erase, kill, intr, quit) and modes (canonical versus raw, echo, signal generation).

Typical usage involves invoking stty with optional settings or flags. Without arguments, it prints the current settings. Common options include -a to display all settings and -g to output a portable stty configuration string that can be saved and later restored. Some implementations accept -F device or --file=DEVICE to operate on a specific device. Settings can be supplied as a sequence of keywords and values, such as 9600 to set the baud rate, erase '^H' to designate the erase character, or -echo to disable input echo. Examples: stty -a; stty sane; stty 115200; stty -echo; stty erase '^?'.

For Linux, BSD, and other Unix-like systems, stty operates on the active terminal or a specified device, and its exact options may vary by implementation. It originated in BSD and has been incorporated into POSIX, with modern variants providing similar functionality. It is commonly used in shell scripts to configure terminals for interactive programs, to adjust input handling in remote sessions, and in debugging terminal configurations.

In summary, stty provides a concise interface to inspect and tailor terminal behavior, affecting how input is read, how output is produced, and how the terminal responds to control characters and user signals.