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Doesn't create a file
Make sure to list the files / directories in the same order every time.
Replace "user/sbin/sshd" with the file you would like to check. If you are doing this due to intrusion, you obviously would want to check size, last modification date and md5 of the md5sum application itself. Also, note that "/var/lib/dpkg/info/*.md5sums" files might have been tampered with themselves. Neither to say, this is a useful command.
This is mostly for my own notes but this command will compute a md5 message digest from the command line.
You can also replace md5sum with other checksum commands (e.g., sha1sum)
extracts path to each md5 checksum file, then, for each path, cd to it, check the md5sum, then cd - to toggle back to the starting directory. greps at the end to remove cd chattering on about the current directory.
Nothing special about hashing here, only the use of cut, I think, could result at fewer keystrokes.