check md5sum from pipe

You do this:

cat file | md5sum > sumfile

And the next day you can do this:

cat file | md5sum --check sumfile

Which prints:

-: OK

if everything is alright.

I assume that you do know the md5sum of the file.

Just issue the following command:

echo ff19e3f8bde936457b8e53c825110987 myfile | md5sum --check -
myfile: OK

md5sum --check, like md5sum with any other option (or none) takes input from stdin if no file (or -) is specified on the command line.

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