May 26, 2018

Helps debug programs which fiddle with their tty settings

pty is a tool to help debug console programs which take the terminal out of canonical mode, by allowing the program being debugged and the debugger to run on separate terminal devices.

To use pty, the programmer changes to the terminal device where he or she wishes to interact with the program to be debugged, and at the shell prompt, runs pty with no arguments. Pty will print out the filename of the slave side of the pseudo-terminal it has opened. Inside the debugger, running in another terminal device, one then redirects the program to be debugged’s IO to the slave tty command of gdb. When you are finished using pty, you must manually kill it. When pty starts it prints out its pid.

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