How to see /etc files have been changed after installing the DEB

DEB packages often contain configuration files installed under /etc. To see if an admin has changed any package provided configuration files, use the following command:

$ dpkg-query -W -f='${Conffiles}\n' '*' |
  awk 'OFS="  "{print $2,$1}' |
  md5sum -c 2>/dev/null |
  awk -F': ' '$2 !~ /OK/{print $1}'

Source: https://serverfault.com/a/90401

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