MD5SUM
Show MD5SUM progress
pv backup.tar.bz2 |md5sum
Recursive MD5SUM
find . ! -type d -print0 | xargs -0 md5sum >md5.txt
MD5SUM Check for mfd.txt containing CRLF line changes
perl -wpe 's/\r//g' md5.txt | md5sum -c -
MD5SUM Check for normal md5.txt created under UNIX
md5sum -c md5.txt