This file is indexed.

/bin/cgroups-umount is in cgroup-lite 1.9.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Copyright 2011 Canonical, Inc
# Author: Serge Hallyn <serge.hallyn@canonical.com>

set -e

# We don't care to move tasks around gratuitously - just umount
# the cgroups

# If /sys/fs/cgroup is not mounted, we don't bother
mountpoint -q /sys/fs/cgroup || exit 0

cd /sys/fs/cgroup
for d in `sed -e '1d;s/\([^\t]\)\t.*$/\1/' /proc/cgroups`; do
    mountpoint -q $d && umount $d
    [ -d $d ] && rmdir $d || true
done

exit 0