Autorun a script after I plugged or unplugged a USB device

What can I do to run automatically a script after I mount/plugin or unmount/unplug a USB device?

Thanks to MinimusHeximus and the respective contributors to the thread he mentioned in his comment to my similar question, I think I can now offer you the following answer.

You'll need 5 (five) files for such a USB device as follows, simply filling in respective values <fortheseparts>:

/etc/udev/rules.d/00-usb-<yourdevice>.rules

ACTION=="add", ATTRS{idVendor}=="<yourvendorid>", ATTRS{idProduct}=="<yourproductid>", ENV{XAUTHORITY}="/home/<user>/.Xauthority", ENV{DISPLAY}=":0", OWNER="<user>", RUN+="/usr/local/bin/usb-<yourdevice>-in_udev"    
ACTION=="remove", ATTRS{idVendor}=="<yourvendorid>", ATTRS{idProduct}=="<yourproductid>", ENV{XAUTHORITY}="/home/<user>/.Xauthority", ENV{DISPLAY}=":0", OWNER="<user>", RUN+="/usr/local/bin/usb-<yourdevice>-out_udev"

/usr/local/bin/usb-<yourdevice>-in_udev

#!/bin/bash
/usr/local/bin/usb-<yourdevice>-in &

/usr/local/bin/usb-<yourdevice>-in

#!/bin/bash
sleep 1
<yourbashscriptcode>

/usr/local/bin/usb-<yourdevice>-out_udev

#!/bin/bash
/usr/local/bin/usb-<yourdevice>-out &

/usr/local/bin/usb-<yourdevice>-out

#!/bin/bash
sleep 1
<yourbashscriptcode>

Notes:

1. You can capture the values <yourvendorid> and <yourproductid> by entering the command lsusb in Terminal -- when your USB device is plugged in -- which will list all your USB devices currently available, like Bus 003 Device 002: ID 8087:07da Intel Corp., where 8087 is the VendorID and 07da is the ProductID.
2. And <yourdevice> can be any arbitrary name you may choose for your USB device, for example, I chose to use the generic name "keyboard" when creating such files for my USB keyboard which required applying a different keyboard layout whenever it's plugged in.
3. In some scenarios, it may not be necessary to use the ACTION=="remove" line in the udev rules file, and hence the associated 2 (two) "out" files, when you don't need to do anything (e.g. reverse a change made when the device is plugged in) after the device is plugged out.

The file manager SpaceFM allows that. See Auto Run settings, for example Auto Run | On Mount or Auto Run | On Unmount.