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I need to deal with two pieces of custom hardware which both send debugging data over two serial connections. Those serial connections go through two serial-to-USB converters. The serial-to-USB devices have the same vendor numbers, device numbers, and, apparently, the same serial numbers. Here's the issue: I want to log the two serial ports separately. The custom hardware needs to be rebooted constantly, and whether they attach to the same /dev/ttyUSB* is completely random. How can I make them pick the same device path every time? I could make it dependent on what port it is plugged into, but that seems kind of hacky. So, I ran a diff against the output of udevadm, like so: $ udevadm info -a -p `udevadm info -q path -n /dev/ttyUSB1` > usb1 $ udevadm info -a -p `udevadm info -q path -n /dev/ttyUSB2` > usb2 $ diff usb1 usb2 The output of the diff is long; you can see it here Grepping for serial (same for both): $ udevadm info -a -p `udevadm info -q path -n /dev/ttyUSB2` | grep serial SUBSYSTEMS=="usb-serial" ATTRS{serial}=="0001" ATTRS{serial}=="0000:00:1d.7" Other info: I'm using PuTTY to read from the serial ports. OS: $ uname -a Linux xxxxxxxx.localdomain 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

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