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So I'm currently trying to get udev to do some things (start airmon-ng) after I've connected a specific USB wifi network card. But I am having troubles getting inline scripts to work. The problem can be reproduced using the following simple example:

Create the following executable script /test.sh:

#!/bin/sh
echo hello > /tmp/test.txt

Create the following file /etc/udev/rules.d/85-auto-monitor.rules:

# This works:
ACTION=="move", KERNEL=="wlx8416f91a5ed3", RUN+="/test.sh"

# This does not work:
# ACTION=="move", KERNEL=="wlx8416f91a5ed3", RUN+="sh -c 'echo hello > /tmp/test.txt'"

Use the following command to reload the .rules file:

sudo udevadm control --reload 

I simply can't understand why the external script works but not the inline one. The inline scripts works if I run it in my terminal.

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