find SCSI and USB scanners and their device files


sane-find-scanner [-?|-h|--help] [-v] [-q] [-p] [-f] [-F filename] [de‐ vname]


sane-find-scanner is a command-line tool to find SCSI and USB scanners and determine their Unix device files. Its primary aim is to make sure that scanners can be detected by SANE backends. For SCSI scanners, it checks the default generic SCSI device files (e.g., /dev/sg0) and /dev/scanner. The test is done by sending a SCSI inquiry command and looking for a device type of "scanner" or "proces‐ sor" (some old HP scanners seem to send "processor"). So sane-find-scanner will find any SCSI scanner connected to those default device files even if it isn't supported by any SANE backend. For USB scanners, first the USB kernel scanner device files (e.g. /dev/usb/scanner0), /dev/usb/scanner, and /dev/usbscanner) are tested. The files are opened and the vendor and device ids are determined, if the operating system supports this feature. Currently USB scanners are only found this way if they are supported by the Linux scanner module or the FreeBSD or OpenBSD uscanner driver. After that test, sane-find-scanner tries to scan for USB devices found by the USB li‐ brary libusb (if available). There is no special USB class for scan‐ ners, so the heuristics used to distinguish scanners from other USB de‐ vices is not perfect. sane-find-scanner also tries to find out the type of USB chip used in the scanner. If detected, it will be printed after the vendor and product ids. sane-find-scanner will even find USB scanners, that are not supported by any SANE backend. sane-find-scanner won't find most parallel port scanners, or scanners connected to proprietary ports. Some parallel port scanners may be de‐ tected by sane-find-scanner -p. At the time of writing this will only detect Mustek parallel port scanners.


-?, -h, --help Prints a short usage message. -v Verbose output. If used once, sane-find-scanner shows every de‐ vice name and the test result. If used twice, SCSI inquiry in‐ formation and the USB device descriptors are also printed. -q Be quiet. Print only the devices, no comments. -p Probe parallel port scanners. -f Force opening all explicitly given devices as SCSI and USB de‐ vices. That's useful if sane-find-scanner is wrong in determin‐ ing the device type. -F filename filename is a file that contains USB descriptors in the format of /proc/bus/usb/devices as used by Linux. sane-find-scanner tries to identify the chipset(s) of all USB scanners found in such a file. This option is useful for developers when the out‐ put of "cat /proc/bus/usb/devices" is available but the scanner itself isn't. devname Test device file "devname". No other devices are checked if de‐ vname is given.


sane-find-scanner -v Check all SCSI and USB devices for available scanners and print a line for every device file. sane-find-scanner /dev/scanner Look for a (SCSI) scanner only at /dev/scanner and print the result. sane-find-scanner -p Probe for parallel port scanners.


USB support is limited to Linux (kernel, libusb), FreeBSD (kernel, libusb), NetBSD (libusb), OpenBSD (kernel, libusb). Detecting the ven‐ dor and device ids only works with Linux or libusb. SCSI support is available on Irix, EMX, Linux, Next, AIX, Solaris, FreeBSD, NetBSD, OpenBSD, and HP-UX.


No support for most parallel port scanners yet. Detection of USB chipsets is limited to a few chipsets. 13 Jul 2008 sane-find-scanner(1)


sane(7), sane-scsi(5), sane-usb(5), scanimage(1), xscanimage(1), xsane(1), sane-"backendname"(5)


Oliver Rauch, Henning Meier-Geinitz and others

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