dpkg -L manpages-dev | grep -ie 'man[23]/' | sort |
while read file; do
	if [ -L "$file" ]; then continue; fi
	man -l "$file" | sed -n '0,/DESCRIPTION\|Feature Test/p' |
	grep -v -e '^[ \t]*$' -e '^[^ \t]' -e 'Feature Test' |
	sed 's/^[ \t]*//'
	echo
done