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Lets say i have an existing directory and someone did cp -r over this and some files changed. I want to detect this change. How can i do it ?

I thought of using md5 or some checksum calculator for directory but it could make my program slow since directory size can be way huge.

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    you can use a backup or rsync to compare in simulation mode of course it will be really faster that the md5 method Commented Jul 15, 2020 at 12:57
  • Please be more specific. Tell us what directory we're talking and if your goal is informative or tampering detection. Is it a personal or system directory? Debian holds e.g. package checksums at /var/lib/dpkg/info/*.md5sums (that can be edited by privileged users). For private data you may as well use git. Tampering detection is a whole other can of worms. Commented Jul 15, 2020 at 13:58

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