I’m sorry, Nicholas – I don’t have a V5 to try this out on and see! This is an older post though, so perhaps there are more updated methods to do this. If I run across any or can bench test this on a 5 I’ll update the post. Good luck!

I’ve not tried this on the latest Bullseye. Things always have to change. 🙁 I was assuming sda1 or the like myself, since the parameter is fed in from the service. If I get a chance to try this on the latest version of Raspbian soon I’ll see if I can tweak it. This article in particular was a bit of me scrounging around per the references.

#!/bin/bash

PART=$1
FS_LABEL=lsblk -o name,label | grep ${PART} | awk '{print $2}'
echo $PART
echo $LABEL

and did run in on RPI 4 BullsEye command line.

Result is

Usage: grep [OPTION]… PATTERNS [FILE]…
Try ‘grep –help’ for more information.

What exactly do you want to achieve? Do you know what $1 is in practice? Can only guess “sda1” in my case…

Thank you, James!

• /usr/lib/systemd/system/: units provided by installed packages
• /etc/systemd/system/: units installed by the system administrator

And rather than reboot, UDEV should automatically detect new rules[2], but if it fails to:

udevadm control --reload

Thank you!