linux-firmware/debian-firmware/debian/scripts/check-symlinks

#!/bin/bash -eu
#
# Check for dangling symlinks
#

if [ $# -ne 1 ] ; then
	echo "Usage: check-symlinks <dirname>" >&2
	exit 2
fi

if ! [ -d "${1}" ] ; then
	echo "No such directory: ${1}" >&2
	exit 1
fi

echo "Check for dangling symlinks in ${1} ..."

if [ "$(find "${1}" -xtype l | wc -l)" -ne 0 ] ; then
    echo "Error: Dangling symlinks found" >&2
    find "${1}" -xtype l
    find . -xtype l -exec rm {} \; && exit 0 || exit 1
fi