USB serial ports by serial number

[Hans Petter Selasky]

On 2019-10-03 09:37, O'Connor, Daniel wrote:
> 
> 
>> On 3 Oct 2019, at 17:01, Hans Petter Selasky <hps at selasky.org> wrote:
>> On 2019-10-03 08:56, O'Connor, Daniel wrote:
>>> Most of USB-serial devices have "very stable" serial number:)
>>> more than 50% have S/N "0123456789".
>>
>> It is also allowed to have no serial number.
> 
> Yes, that's why I match sernum to '.+' to skip those.
> 
>> Maybe some kind of "lstty" would do.
>>
>> -l  -  list all devices
>> -s  -  match by serial
>> -v  -  match by vendor
>> -p  -  match by product
>> -i  -  match by interface ID
>> -t  -  type [USB/PCI]
>>
>> which simply output the tty number you need. Could be an API we could add to libusb.
> 
> The problem is you can't modify some program to call a new API a lot of the time but it is usually trivial to change which serial port it's configured to use.
> 

You don't need to change any program:

cu /dev/cuaU`lstty -s SERIAL`

--HPS