https://github.com/util-linux/util-linux/blob/master/login-utils/login.c#L1565 https://github.com/util-linux/util-linux/blob/master/login-u... edit: basically

https://github.com/util-linux/util-linux/blob/master/login-utils/login.c#L1565 https://github.com/util-linux/util-linux/blob/master/login-u... edit: basically login(1) execes your shell with - prepended, so an example where POSIX expects this