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When my machine reboots it's a lottery which USB devices get assigned to which ttyUSBn.

Therefore I have to rename /etc/ppp/options.ttyUSB0 periodically.

I've tried /etc/ppp/options.usb-FTDI_FT232R_USB_UART_00000000-if00-port0 but that doesn't work.

Is there a way of doing it?

All I can think of is a cron @reboot job for root

#!/bin/sh
tty=$(ls -l /dev/serial/by-id | grep FTDI | cut -d '/' -f 3)
cp /etc/ppp/options.usb-FTDI_FT232R_USB_UART_00000000-if00-port0 "/dev/ppp/options.$(tty)"
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  • (ppp in 2023?) Anyway... shouldn't udev do this for you? Commented Mar 20, 2023 at 11:58
  • 1
    It's for my 1993 Mac LCIII. Commented Mar 20, 2023 at 12:06
  • USB in a computer made before USB existed? Commented Mar 20, 2023 at 12:10
  • I would assume judicious use of some udev rules would work. Commented Mar 20, 2023 at 13:39
  • I don't know what udev is so I'll go with the cron script; never mind. Commented Mar 20, 2023 at 15:38

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