/usr/sbin/popfile-pipe is in popfile 1.1.3+dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
cd /usr/share/popfile
export POPFILE_ROOT=/usr/share/popfile
export POPFILE_USER=/var/lib/popfile
umask 0027
exec /usr/share/popfile/pipe.pl "$@"
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