Detect active usb device used by app


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# 1  
Detect active usb device used by app

I've searched a number of sites but thought I'd post it here. I'm want to a detect certain usb device (external camera) that is actively being used by an app on a mac.
My search has led me through looking at the system events log to see if there is a ProductID indicator logged. The device is plugged into the same so researching on how to check any output from the port.
Anyone thoughts on additional ways to tackle this? am i in the right place> appreciate any feedback

So for I have a bash script that detects the usb devices on a mac
Code:
# USB Devices detected 
log "List of USB Devices " 
log ""
USB=`ioreg -p IOUSB -w0 | sed 's/[^o]*o //; s/@.*$//' | grep -v '^Root.*'`
log "$USB"


The following usb devices detected and written to a log file:
Code:
AppleUSBEHCI Root Hub Simulation
IOUSBHostDevice
IOUSBHostDevice
Apple Internal Keyboard / Trackpad
IR Receiver
BRCM20702 Hub
Bluetooth USB Host Controller
Keyboard Hub
Apple Keyboard
AppleUSBXHCI Root Hub Simulation


Last edited by dallas88; 08-20-2019 at 12:16 AM..
# 2  
You can get this information with the macOS command:

Code:
system_profiler

See summary man page here:

https://www.unix.com/man-page/mojave/8/system_profiler/


Code:
root#  system_profiler -usage
Usage: system_profiler [-listDataTypes]
       system_profiler [-xml] [-timeout n] [-detailLevel n]
       system_profiler [-xml] [-timeout n] [dataType1 ... dataTypeN]

  -detailLevel n    specifies the level of detail for the report
                      mini = short report (contains no identifying or personal information)
                      basic = basic hardware and network information
                      full = all available information

  -listDataTypes    lists all the available datatypes

  -xml              generates xml output instead of plain text
                    if redirected to a file with the extension ".spx"
                    the file can be opened in System Profiler.app

  -timeout          specifies the maximum time to spend gathering information
                    the default is 180 seconds, 0 means no timeout

  Redirect stderr to /dev/null to suppress progress and error messages.

Examples:

  system_profiler
     Generates a text report with the standard detail level.

  system_profiler -detailLevel mini
     Generates a short report without identifying/personal information.

  system_profiler -listDataTypes
     Shows a list of the available data types.

  system_profiler SPSoftwareDataType SPNetworkDataType
     Generates a text report containing only software and network data.

  system_profiler -xml >MySystem.spx
     Creates a XML file which can be opened by System Profiler.app

# 3  
Neo, thanks Smilie for the info. This really will save me plenty of time and help with monitoring some usb devices. It help me to know if external device is no longer active
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