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Is it sort of "Amish" to use the bourne shell, still? :D

if is more wasy to do this in perl in my opinion .. there are a lot of modules that can do this.
http://search.cpan.org/~delta/Digest-Perl-MD5-1.6/lib/Digest/Perl/MD5.pm

why not use -c option?

Altho it's not md5, you can use cmp utility to compare 2 files and test return.

If files are different it will return 1, otherwise it will be 0

root@glitch:/myfiles# cat file*
1
2
1...

It might be a difference in whitespaces. You could try double quoting ("$cmd") the variables. But what's wrong with using md5sum -c <file_with_md5_sums>?

Well, do you have /dev/stderr on your UNIX?

If there is no stdout, it is simple:zvar=$( your_command_and_args 2>&1 )