How to view md5 value linux

Shell script to get MD5 value

Linux execution shell calculate md5 value can be calculated by md5sum md5 value of the file or string.

Calculating the md5 value of a file:

Outputting the value directly:

Calculating the md5 value of a string:

The MacOS console doesn’t support the md5sum command by default, so you need to install it through the If you want to use the md5sum command to get the md5 value, you need to install the corresponding content through homebrew.

MAC console by default comes with a md5 command to calculate the md5 value, use the following:

Calculate the file md5 value:

Calculate the string md5 value:

What is MD5 value? How to view the MD5 value of a file?

The full name of MD5 is Message-DigestAlgorithm5, a widely used cryptographic hash function that produces a 128-bit (16-byte) hash value that ensures the integrity of a message.

The MD5 value is equivalent to a file ID, and its value is unique. If a file has been modified (e.g., by an embedded virus, Trojan horse, etc.), its MD5 value will change. For this reason, some regular download URLs provide the file MD and usually provide the MD5 value. If users find after downloading that their MD5 value does not match the site’s announcement, the file may have been modified or there may have been an error in the download.

MD5 value of the way to view:

1, Baidu search for MD5 value of the viewer tool “HashMyFiles” and click to enter the official website:

2, enter the official website to scroll down to find the Simplified Chinese mode and download:

3, double the MD5 value of the file, and then download the file, the MD5 value is not the same as the one announced by the website. p>

3, double-click to open the downloaded package, then find the “HashMyFiles.exe” file and double-click to run:

4, the need to view the MD5 value of the file dragged into the software that just opened, and then the software will be displayed inside the dragged into the file’s MD5 value!

Linux how to view the file md5 value

Linux query file md5 value: md5sumxxx.iso.md5

MD5 algorithm is often used to verify the integrity of the network file transfer, to prevent the file from being tampered with. md5 full name is the Message- DigestAlgorithm5 (MD5). DigestAlgorithm5), this algorithm calculates the information of any length bit by bit, and produces a binary length of 128 bits (the hexadecimal length is 32 bits) of the “fingerprint” (or “message digest”), and different The likelihood of different files producing the same message digest is very, very small.

On Linux or Unix, md5sum is a utility program that calculates and verifies file digests. Generally, after installing Linux, the tool md5sum is available and is run directly from the command line terminal directly. You can use the following command to get the md5sum command help manmd5sum

Use md5sum to generate fingerprints (message digests) command is as follows: md5sumfile>file.md5 or md5sumfile>>file.md5

Note: The difference between > and >& gt; is that > redirects the summaries generated by file to file.md5, but overwrites the contents of file.md5; >> appends the output summaries to the file.md5 file. You can also output a summary of several files to an md5 file, which uses the wildcard character *, for example, there are several iso files in a directory, to output a summary of these iso files to the iso.md5 file, the command is as follows: md5sum*.iso>iso.md5

Using the md5 summary to validate a file, there are two ways to do it: <

a, put the downloaded file file and the file.md5 message digest file in the same directory, and then use the following command to verify: md5sum-cfile.md5 and then if the verification is successful, then it will be output: correct;

b, downloaded the file file, and then run the following command: md5sumfile The command will output an md5 message summary, and then compare this message summary directly with the contents of file.md5, if the same, it means that the verification is correct.

Linux system recursively generate the directory of files in the md5 method

This article mainly introduces the Linux system recursively generate the directory of files in the md5 method, the use of PHP scripts to achieve, the need for friends can refer to

linux use md5sum recursively generates the entire directory of the md5

Today to use the md5sum operation directory, recursively generate the md5 value of all the files in the directory, the results found that it does not support recursive operations so wrote a php script to deal with it

Code:

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?php

$path=’/data/www/bbs/source’;

$outfile=’file.md5′;

get_file_md5($path,$outfile);

functionget_file_md5($path,$outfile)

{

$path=rtrim($path,’/’);

if(function_exists(‘scandir’))

{

$files=scandir($path);

foreach($filesas$v)

{

if($v!=’.’ $v!=’…’)

{

$file=$path.’/’. $v;

if(is_dir($file))

{

get_file_md5($file,$outfile);

}else

{

file_put_contents($outfile,md5_ file($file).”” . $file.”/n”,FILE_APPEND);

}

}

}

}

}else

{

$files=opendir($path);

while(($f=readdir($files)) ! ==false)

{

if($f==’.’ ||$f==’…’)

continue;

$file=$path.’/’. $f;

if(is_dir($file))

{

get_file_md5($file,$outfile);

}else

{

file_put_contents($outfile,md5_ file($file).”” . $file.”/n”,FILE_APPEND);

}

}

closedir($files);

}

}

}

Note: Two spaces between the generated md5 value and the file, or else it results in an error as follows

The code is as follows:

md5sum:file1.md5:noproperlyformattedMD5checksumlinesfound

There’s an even simpler one, use the linux find command to get it done in one sentence

Code:

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find/data/www/bbs/source-typef-print0|xargs-0md5sumfile2.md5

Test

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md5sum-cfile1.md5

md5sum-cfile2.md5

as shown

This outputs all the test results to the screen, and if the last one displays this message md5sum:WARNING:2of1147computedchecksumsdidNOTmatch then it means that there are 2 out of 1147 that do not match

Then we can

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md5sum-cfile1.md5|grepFAILED

It’s easy to know which files have been tampered with

.