Md5 command in linux

How to get the MD5 hash of a string directly in the terminal?

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 

9 Answers 9

You can also say something like this :

~$ echo -n Welcome | md5sum 83218ac34c1834c26781fe4bde918ee4 - 

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

You also want to update the example result, as 7803ffca. is the result with the added newline. The correct result for the command above is 83218ac34c1834c26781fe4bde918ee4 —

Please correct me if I’m wrong, but I think this is because the MD5sum was applied to a stream of data, as opposed to reading a file content, which has a name associated to it.

Notice that the -n is mandatory. Without it, your hash will be totally wrong since it includes the newline character.

@alper echo -n Welcome | md5sum | awk ‘‘ will take the first «column» separated by spaces. You could also use cut as well.

Very simple, it accepts stdin, so

To avoid the trailing newline added by the shell:

printf '%s' "my string" | md5sum 

+1 for using printf correctly. If you want to have the sum without the — , put | cut -d ‘ ‘ -f 1 . Example usage: sum=$(printf ‘%s’ ‘some string’ | md5sum | cut -d ‘ ‘ -f 1)

it’s weird but the

I got wrong result with the first command b9bfa87a6a126911f2246c7a615bff27 — instead of 2ba81a47c5512d9e23c435c1f29373cb —

$ echo -n 123456 | md5sum | awk '' e10adc3949ba59abbe56e057f20f883e 

you can create a shell script.

For example,the script name is md5.sh:

#!/bin/bash echo -n $1 | md5sum | awk '' 

$ md5.sh 123456 e10adc3949ba59abbe56e057f20f883e 

If your system is macOS. You need to modify this script:

$ echo -n 123456 | md5 | awk '' e10adc3949ba59abbe56e057f20f883e 

I created a function md5() < echo -n $1 | md5sum | awk '‘; > in .bashrc and then I can use $ md5 test in the command line. thanks for the answer

openssl md5 filename openssl sha1 filename 

For string pipe the content using echo

echo -n 123456 | openssl md5 

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.

@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.

My quick poke at the —help for md5sum demonstrates that the command:

will then give a prompt for simple input. Inputting some text and then using Enter and then Ctrl + D to signify end of file then causes md5sum to spit out the MD5 of the raw text you entered (including that Enter , it’s a CR, IIRC).

Less to type and no piping! And avoiding your plaintext password being recorded in shell history! Woo!

If you do not want that trailing CR (which is usually the case if you want to hash a password), don’t hit Enter before Ctrl + D , enter Ctrl + D twice instead.

There are many examples to do this, but some of them are not equivalent because some of them explicitly or implicitly include the newline, and some others do not.

I would like to clearly specify which of the popular methods includes the newline and which are not.

Here are some examples along to calculating the md5 hash WITHOUT trailing newline (CORRECT):

$ echo -n "test" > test.txt $ wc test.txt 0 1 4 test.txt $ md5sum test.txt 098f6bcd4621d373cade4e832627b4f6 test.txt 

Note: -n in echo means: «do not output the trailing newline».

$ echo -n "test" | md5sum 098f6bcd4621d373cade4e832627b4f6 - 

$ printf "%s" "test" | md5sum 098f6bcd4621d373cade4e832627b4f6 - 

Using only md5sum command:

(Let’s write md5sum , press Enter then write string test and then press double combination Ctrl + d )

$ md5sum test098f6bcd4621d373cade4e832627b4f6 - 

(Let’s write md5sum — , press Enter then write string test and then press double combination Ctrl + d )

$ md5sum - test098f6bcd4621d373cade4e832627b4f6 - 

Here are some examples along to calculating the md5 hash WITH trailing newline (SO NOT CORRECT):

$ echo "test" > test_n.txt $ wc test_n.txt 1 1 5 test_n.txt $ md5sum test_n.txt d8e8fca2dc0f896fd7cb4cb0031ba249 test_n.txt 

Using echo WITHOUT -n inline:

echo "test" | md5sum d8e8fca2dc0f896fd7cb4cb0031ba249 - 

Using only md5sum command but with Enter key after writing the text:

(Let’s write md5sum , press Enter then write string test and then press agaien Enter and once combination Ctrl + d )

$ md5sum test d8e8fca2dc0f896fd7cb4cb0031ba249 - 

Using md5sum — command but with Enter key after writing the text:

(Let’s write md5sum — , press Enter then write string test and then press agaien Enter and once combination Ctrl + d )

$ md5sum - test d8e8fca2dc0f896fd7cb4cb0031ba249 - 

Источник

How to Use the md5sum Command in Linux

When you download a file from the internet, it is a good safety practice to check whether you received the original version. Comparing checksums you received from the file creator with the ones you obtain by checking the file yourself is a reliable way to confirm your download’s integrity.

The md5sum command in Linux helps create, read, and check file checksums.

In this tutorial, you will learn how to use the md5sum command to validate the files you receive.

The md5sum Command with Examples

When used on a file without any options, the md5sum command displays the file’s hash value alongside the filename. The syntax is:

After obtaining the hash value, compare it with the MD5 value provided by the file creator.

Note: While md5sum is a reliable method for testing whether the file you received has been compromised, it is useful only if you know that the website you downloaded it from is secure. If hackers gain access to the website, they can change both the file and its checksum, making it appear as if the file you are downloading is safe.

Read in Binary Mode

To read the file in binary mode, use the -b option ( —binary ):

The * character before the file name means that md5sum read it in binary mode.

Read in Text Mode

Use the -t option ( —text ) to read the file in text mode:

Text mode is the default mode for reading files with md5sum .

Create a BSD-Style Checksum

Using the —tag option outputs the hash value in the BSD-style format:

Validate md5 Checksum with a File

To check a file by comparing its hash value with the value provided in a hash file, use the -c option.

1. As an example, create a hash file containing the md5sum output:

md5sum [filename] > [file-containing-hashes]

2. Use the following syntax to compare the hash value from the file you created against the current hash value of the .txt file:

md5sum -c [file-containing-hashes]

3. If you change the contents of the file and repeat the check, a warning message is displayed:

Validate Multiple Files

Use the same md5sum -c procedure to check the integrity of multiple files:

md5sum [filename1] [filename2] [filename3] > [file-containing-hashes]

In the following example, the contents of example2.txt have changed, resulting in a warning message from md5sum :

Display Only Modified Files

The —quiet option displays only the files whose hash value has changed. It skips the output of validated files.

md5sum --quiet -c [file-containing-hashes]

Generate Status Only

The md5sum command with the —status option does not produce any output but returns 0 if there are no changes and 1 if it detects changes. This argument is useful for scripting, where there is no need for standard output.

The example script below illustrates the use of the —status option:

#!/bin/bash md5sum --status -c hashfile Status=$? echo "File check status is: $Status" exit $Status

When the script executes, it shows status 1 , meaning that md5sum detected the change made earlier in example2.txt .

Check Improperly Formatted Checksum Lines

Add the —strict option to exit non-zero for improperly formatted hash values:

md5sum --strict -c [file-containing-hashes]

The example shows the output of md5sum —strict when you put invalid characters in the first line of the file containing hashes:

To display which line has an invalid hash, use -w ( —warn ):

md5sum -w -c [file-containing-hashes]

The example above shows the -w option displaying that the improperly formatted MD5 checksum line is line 1 of the file.

Skip Reporting Status for Missing Files

By default, md5sum shows warnings about the files it cannot find on the system. To override this behavior, use the —ignore-missing option:

md5sum --ignore-missing -c [file-containing-hashes]

In the example below, example1.txt was deleted before running the md5sum command. The output ignores the deleted file:

Show Help and Version Information

To get the official help for the md5sum command, type:

To check md5sum version, type:

Note: You should also check out our overview of the diff command to learn how to compare two files line by line.

After completing this tutorial, you should know how to properly use the md5sum command to create, print, or check MD5 checksums.

Marko Aleksić is a Technical Writer at phoenixNAP. His innate curiosity regarding all things IT, combined with over a decade long background in writing, teaching and working in IT-related fields, led him to technical writing, where he has an opportunity to employ his skills and make technology less daunting to everyone.

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Md5 command in linux

NAME

md5sum - compute and check MD5 message digest

SYNOPSIS

DESCRIPTION

Print or check MD5 (128-bit) checksums. With no FILE, or when FILE is -, read standard input. -b, --binary read in binary mode -c, --check read MD5 sums from the FILEs and check them --tag create a BSD-style checksum -t, --text read in text mode (default) The following five options are useful only when verifying checksums: --ignore-missing don't fail or report status for missing files --quiet don't print OK for each successfully verified file --status don't output anything, status code shows success --strict exit non-zero for improperly formatted checksum lines -w, --warn warn about improperly formatted checksum lines --help display this help and exit --version output version information and exit The sums are computed as described in RFC 1321. When checking, the input should be a former output of this program. The default mode is to print a line with checksum, a space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.

BUGS

The MD5 algorithm should not be used any more for security related purposes. Instead, better use an SHA-2 algorithm, implemented in the programs sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1)

AUTHOR

Written by Ulrich Drepper, Scott Miller, and David Madore.

REPORTING BUGS

GNU coreutils online help: http://www.gnu.org/software/coreutils/> Report md5sum translation bugs to http://translationproject.org/team/>

COPYRIGHT

Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

Full documentation at: http://www.gnu.org/software/coreutils/md5sum> or available locally via: info '(coreutils) md5sum invocation'

© 2019 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd.

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