Cygwin's default consumer interface may be the bash shell working inside the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) devices, and Cygwin ships with a number of terminal emulators that are based on them, including rxvt/urxvt and xterm. The Variation of GCC that comes along with Cygwin https://acgwin95285.p2blogs.com/35783762/acgwin-no-further-a-mystery