/lib/dhcpcd/dhcpcd-hooks/01-test is in dhcpcd5 6.11.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Echo the interface flags, reason and message options
if [ "$reason" = "TEST" ]; then
set | grep "^\(interface\|pid\|reason\|profile\|skip_hooks\)=" | sort
set | grep "^if\(carrier\|flags\|mtu\|wireless\|ssid\)=" | sort
set | grep "^\(new_\|old_\|nd[0-9]*_\)" | sort
exit 0
fi
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