I have a USB device (Pen drive) that collects a lot of data a fills up its storage regularly. The goal is to write a script that:

  • accesses USB device
  • mounts it as a storage device
  • downloads data from the device
  • safely unmounts the device for removal (upon completion of the download)

I found this question.

I have done all things from this but my udev rules are not reflected. The shell script which I have set in .rules file is not running on USB mount. My rules file is /etc/udev/rules.d/99-mydevice.rules:


and my USB system path is /sys/bus/usb/devices/usb1

Am I missing something?

2 Answers 2


Udev statements containing a single = are assignments, not comparisons. For example ATTR{idVendor}="1d6b" tries to assign a newly plugged USB device a particular Vendor ID, and failing since Vendor IDs are read only. You want to use == in comparisons.

  • I tried this too but its not working. My script is as follows: #!/bin/bash cp /media/pi/dev_name/test.txt /home/pi/newfile.txt echo File transfer > log.txt Once USB inserted cant get any logs in log.txt. Plz help on this.
    – Prajakta
    Apr 3, 2017 at 5:29

I tried this and it works for me:

cat /etc/udev/rules.d/11-media-by-label-with-pmount.rules

KERNEL!="sd[a-z]*", GOTO="media_by_label_auto_mount_end" ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="media_by_label_auto_mount_end"

PROGRAM=="/sbin/blkid -o value -s LABEL %N", ENV{dir_name}="%c"

PROGRAM=="/usr/bin/basename '%E{dir_name}'", ENV{dir_name}="%c" ENV{dir_name}=="", ENV{dir_name}="usbhd-%k"

ACTION=="add", ENV{dir_name}!="", RUN+="/bin/su JrtFlash-c '/usr/bin/pmount %N %E{dir_name}'", RUN+="/home/pi/my-script.sh" ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/su JrtFlash-c '/usr/bin/pumount /media/%E{dir_name}'" LABEL="media_by_label_auto_mount_end"

and tested using command:

udevadm test $(udevadm info -q sys-path) 2>&1

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