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tmutil compare gives differences between two backups. But I wonder how do I sort the output by file size? With GNU sort, there is the --human-numeric-sort option for this, but the sort which is part of macOS doesn't support this. So how can I sort the result by file size?

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I don't know exactly how sort -h is supposed to work since it mixes the B, K, M and G prefixes, but it was at least workable for me in Mojave:

cat tmutil-compare | grep "M  " | cut -c 3- | sort -h
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To slightly improve upon Andreas' answer, you can sort without having to cut out the beginning part that indicates if it's an addition, removal, or change:

tmutil compare backup-1 backup-2 | grep "^[\!+-]" | sort -h -k 2 (The grep part filters out the summary lines)

The names "backup-1/2" are the full paths to two timestamped backup directories, eg /Volumes/Backup/Backups.backupdb/Computer-Name/2020-09-10-123220. You can also pass in sub-folders if you just want to compare those, though I think they need to both point to the same path within their respective backups.

Or if you want to filter by just additions (+) and modifications (!) without removals (-), for example:

tmutil compare backup-1 backup-2 | grep "^[\!+]" | sort -h -k 2

Note that the "!" needs to be escapes as it's got special meaning in bash.

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