/usr/bin/Fenv is in ferret-vis 6.9.3-4build1.
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
# Fenv
# list the environment variables relevant to the FERRET program
. /usr/share/ferret-vis/bin/ferret_paths
env | grep FER | sort
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