Cygwin's default person interface is definitely the bash shell running within the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) devices, and Cygwin ships with numerous terminal emulators which are depending on them, which includes rxvt/urxvt and xterm. The Edition of GCC that includes Cygwin has different extensions https://acgwin07307.idblogmaker.com/36181479/little-known-facts-about-acgwin