Cygwin's default user interface may be the bash shell working inside the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) gadgets, and Cygwin ships with several terminal emulators which might be determined by them, like rxvt/urxvt and xterm. The Model of GCC that includes Cygwin has different extensions https://chanceuvwwv.onzeblog.com/37212209/the-best-side-of-acgwin