Dir.chdir               File.truncate           Process.egid=
Dir.chroot              File.umask              Process.fork
Dir.mkdir               IO.fctrl                Process.kill
Dir.rmdir               IO.ioctl                Process.setpgid
File.chmod              Kernel.exit!            Process.setpriority
File.chown              Kernel.fork             Process.setsid
File.flock              Kernel.syscall
File.lstat              Kernel.trap