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How to do a checksum across different OS's.

Commands on the same line should produce results that are comparable to each other. This allows you to transfer a file from one machine to another, and confirm that the file has the same contents on both the sender and receiver.

Linux Solaris AIX HP-UX Windows any Unix
md5sum filename digest -a md5 -v filename csum -h MD5 filename md5sum filename fciv filename perl -MDigest::MD5 -le 'open$fh,shift;print Digest::MD5->new->addfile($fh)->hexdigest' filename