/usr/share/doc/ppp/examples/userscripts-up is in ppp 2.4.5-5ubuntu1.
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 | #!/bin/sh -e
getent passwd | awk -F: '{print $1 " " $6}' | \
while read user home; do
[ -x $home/.ip-up.d/ ] && su $user run-parts $home/.ip-up.d/
done
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