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How do I get the MD5 hash of a string directly from the terminal?

For example, I want the string abcdefg hashed. Currently the md5sum command only accepts a filename as input. I want to simply enter the following line and everything be done with.

md5sum abcdefg
output: ac54bcf346e578feb46888b3ecd2344f

How can I achieve that?

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4 Answers 4

up vote 36 down vote accepted

You can also say something like this :

~$ echo -n Welcome | md5sum
7803ffcaea43bb81a439fde13b29bc35  -

It basically does the same thing as described by @enzotib, but is perhaps a bit simpler.

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You should add the -n flag to echo unless you want the newline included in the value being md5summed. –  David Jul 20 '11 at 12:49
    
Yep. you're right. –  jfmessier Aug 1 '11 at 14:32
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Very simple, it accepts stdin, so

md5sum <<<"my string"

To avoid the trailing newline added by the shell:

printf '%s' "my string" | md5sum
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ahhh you saved me! thanks a zillion! –  Hamed Momeni Jul 20 '11 at 11:14
    
@Hamed: if you are satisfied with the answer, you have the option to give it a vote, or better you can accept the answer (or both). –  enzotib Jul 20 '11 at 11:19
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yeah I know. I was waiting for the time limit! ;) –  Hamed Momeni Jul 20 '11 at 11:36
    
Giving both @messier and @enzotib a vote; both fall in my prized "elegant simplicity" category. I'd be apt to use the <<<" pipe in a script; echo string wins for the commandline. Well done. –  Tom Jul 20 '11 at 17:01
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Yes, it does, as I said between first and second example –  enzotib Jul 21 '11 at 18:32
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Running md5sum with no arguments at all will cause it to read input from the terminal. Type or paste whatever you want, and when you are done, press ctrl-d to end the input.

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yeah, you're right too. but ctrl+d needs to be pressed twice for it to work. –  Hamed Momeni Sep 30 '11 at 13:57
    
@James, if it does not follow a newline, yes. If you hit it after hitting enter, it only needs once. When it does not follow a newline, it just forces all of the characters typed on the line so far to be processed immediately instead of waiting for a newline. –  psusi Sep 30 '11 at 14:42
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My quick poke at the --help for md5sum demonstrates that the command:

md5sum -

will then give a prompt for simple input. Inputting some text and then using Ctrl+D to signify end of file then causes md5sum to spit out the MD5 of the raw text you entered.

Less to type and no piping! Woo!

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