md5sum

#calculate md5 check sum of a file and print it out to stdout
md5sum file
06187709687154b49de400a8b0d42059 file

#calculate md5 check sums of all files in a current folder and save them in text file for future verification
md5sum * > md5sum.txt

# verify the check sums for the files in a current foldern
md5sum -c md5sum.txt

file1 OK
file2 OK
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