debian, diff, config default

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http://serverfault.com – I want to know if is posible to get the diff on the original versus the current config files of installed debian packages. If found an answers which shows up the modified config files, but I find no way to generate the diff. The command is dpkg-query -W -f='${Conffiles}\n' '*' | awk 'OFS=" "{print $2,$1}' | LANG=C md5sum -c 2>/dev/null | awk -F': ' '$2 !~ /OK/{print $1}' | sort | less (HowTos)