ls: write error: Device or resource busy about poisontap HOT 11 CLOSED

Same here.
I figure it's about the line ls /sys/class/udc > UDC. Before running the script the file /sys/kernel/config/usb_gadget/poisontap/UDC doesn't exist. Afterwards it does. I don't have a clue why the script can create it, but can't write to it.

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Did you follow the installation instructions in README.md?

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Yes i followed the installation instructions at the bottom of readme.md

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So you're saying pi_startup.sh is already in /etc/rc.local per the instructions, but you're running it a second time as demonstrated in your screenshot? You should only run it once.

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I followed everything but the addition to rc.local so I could see possible errors when running it manually - as it doesn't work.

It seems to be the same error when the script is executed in rc.local because after booting/sys/kernel/config/usb_gadget/poisontap/UDC exists but is empty.

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May want to try following https://gist.github.com/jgamblin/459d7db3b4e8441cc210b35abb5d7181 or https://gist.github.com/gbaman/50b6cca61dd1c3f88f41 in case there is something I missed in the installation

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It partially works on my ubuntu computer, it only runs when i type 1.0.0.1 in the browser and not all requests are made to the pi zero.
Also windows doesn't recognize the pi as a network adapter.

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Why did you use a 128.0.0.0 subnet and not a 0.0.0.0 subnet?

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What version of Windows?

128.0.0.0 works on every OS I tested where 0.0.0.0 doesn't. I do want to update dhcpd.conf to use a short lease time, and have the subnet dynamically switch between the lower half and upper half of the IPv4 space but haven't had a chance to, where the usb0 interface will hold an IP in both halves.

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I am using windows 10.
And is it possible to emulate multiple lan adapters?

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the problem seems to be the one-liner, splitting it worked for me:

name="$(ls /sys/class/udc)"
echo "$name" >UDC

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