//usage: "[-cehmLF] [-s SPEED] [-p PROTOCOL] DEVICE"
//usage:#define slattach_full_usage "\n\n"
//usage: "Attach network interface(s) to serial line(s)\n"
-//usage: "\nOptions:"
//usage: "\n -p PROT Set protocol (slip, cslip, slip6, clisp6 or adaptive)"
//usage: "\n -s SPD Set line speed"
//usage: "\n -e Exit after initializing device"