Cygwin's default user interface will be the bash shell operating within the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) products, and Cygwin ships with a variety of terminal emulators that happen to be based upon them, like rxvt/urxvt and xterm. The Model of GCC that includes Cygwin https://devinoppoo.thekatyblog.com/35597065/considerations-to-know-about-acgwin