vimdiff rsync -rvnc

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vimdiff /path/to/file scp://username@remotehost//path/to/file


If you just want to see what files are different, rather than a diff of the actual files, then you can use rsync --dry-run
You can use rsync in dry run mode, as suggested briefly in another answer. It lists any files that are different.
For that, use the rvnc options (r=recursive, v=verbose, n= dry-run, c=checksum). With rsync in pull mode (rsync [OPTION...] [USER@]HOST:SRC... [DEST]), an example is:

rsync -rvnc root@182.18.158.207:/var/www/html/dev/ .

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