Cygwin's default user interface is the bash shell operating within the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) gadgets, and Cygwin ships with numerous terminal emulators which can be depending on them, which includes rxvt/urxvt and xterm. The Edition of GCC that includes Cygwin has different extensions https://cesarjwfov.acidblog.net/68089220/everything-about-acgwin