Cygwin's default user interface will be the bash shell operating inside the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) gadgets, and Cygwin ships with several terminal emulators which can be depending on them, which include rxvt/urxvt and xterm. The Variation of GCC that comes along with Cygwin https://acgwin19639.blog4youth.com/37739610/acgwin-fundamentals-explained