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User: artinside (517)
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$ pwd: /proc/self/root/lib/udev/rules.d/
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File: //proc/self/root/lib/udev/rules.d/70-cups-libusb.rules
# Allow the lp group to read and write raw USB devices for printers.
# This is required for the CUPS usb backend when built with libusb
# support.
ACTION=="add", SUBSYSTEM=="usb", \
  ATTR{bInterfaceClass}=="07", ATTR{bInterfaceSubClass}=="01", \
  RUN+="/usr/bin/setfacl -m g:lp:rw /dev/%P"
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