How to create MD5 Checksums and validate a file in Linux
This article will explain how to generate a MD5 Checksum on a file or list of filesa and also how to validate a file against a known MD5 Checksum. For those of you that are not familiar with MD5 Checksums, the purpose is to validate the integrity of a file that may have been corrupted or tampered with. For example, it is possible for file to be corrupted in the process of downloading it from a website or FTP server. In order to verify if it has been corrupted or not, the publisher of the file you downloaded can include a MD5 Checksum (a string of numbers of letters) which is compared to the file you just downloaded. If the two checksums match, that means the files are identical – no corruption has occurred. Now lets take a look at some examples.
Generate MD5 Checksum on a single file
Generate MD5 Checksum on multiple files
md5sum filename1 filename2 filename3
Generate MD5 Checksum and ouptut to file
md5sum filename > md5.txt
Compare MD5 Checkum output file to current file in directory
md5sum -c md5.txt
Example of what a MD5 Checksum looks like
Thanks, very helpful!
6 yr old post and still SPOT ON. Thank you.
Pretty straight forward explanation.
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