> sock.send_filelist(commandline.list) Instead of a "filelist", it's got to be a remote shell command argument, since it allows stuff like: scp server:'$(

> sock.send_filelist(commandline.list) Instead of a "filelist", it's got to be a remote shell command argument, since it allows stuff like: scp server:'$( comm -23 \ <(find dir1 -type f -printf "%P\n" | sort) \ <(find dir2 -type f -printf "%P\n" | sort) \ | sed "s:^:dir1/:" )' . I'm not sure what you propose for client-side verification in this case.