I want to list usb ports in linux and then send a message to the printer connected to it. That message is sensed by the printer to open the cash drawer. I know I can use echo - e and a port name, but my difficulty is finding the port name. How can I list the available ports or the ports that are currently used?
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1 Answer
The lsusb command will yield the list of recognised usb devices. Here is an example:
$ lsusb Bus 002 Device 003: ID 1c7a:0801 LighTuning Technology Inc. Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 004: ID 04ca:f01c Lite-On Technology Corp. Bus 001 Device 003: ID 064e:a219 Suyin Corp. Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub You can note that the information provided include the bus path as well as the vendorId/deviceId. I'm not sure what "the ports that are currently used" actually means.
Edit
To write a message to the device on bus 1 device 2 you must access the device
$ ls -l /dev/bus/usb/001/002 crw-rw-r-- 1 root root 189, 1 2011-06-04 03:11 /dev/bus/usb/001/002 
