+//usage:#define slattach_trivial_usage
+//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: "\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"
+//usage: "\n -h Exit when the carrier is lost"
+//usage: "\n -c PROG Run PROG when the line is hung up"
+//usage: "\n -m Do NOT initialize the line in raw 8 bits mode"
+//usage: "\n -L Enable 3-wire operation"
+//usage: "\n -F Disable RTS/CTS flow control"
+