How to sync S3 with millions of files at root

[darrepac]

Here is the corrected script

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rclone lsf -R source:bucket | sort > source-sorted
rclone lsf -R dest:bucket | sort > dest-sorted
comm -23 source-sorted dest-sorted > to-transfer
comm -13 source-sorted dest-sorted > to-delete
rclone copy --files-from to-transfer --no-traverse source:bucket dest:bucket
rclone delete --files-from to-delete --no-traverse dest:bucket