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diff -R

You can use numerous tools to compare/manage branches; md5sum / shasum (md5 is usually useful, though not entirely safe), diff and kin, vimdiff, rsync, fdupes, jdupes, git, hg.

I went the „git” way once and I found it really cool! With all the goodies you get for free from git, like applying patches, checking differences, resetting to previous state etc.

Same, but with mercurial.

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