How to recursively generate md5 of files in a directory in Linux system, linuxmd5_PHP tutorial

Linux system recursively generates md5 of files in a directory, linuxmd5

use md5sum under linux to recursively generate md5 of the entire directory
Today I am going to use md5sum to operate a directory and recursively generate the md5 values ​​of all files in the directory. I found that it does not support recursive operations, so I wrote a php script to handle it
Code:

  <&#63;php  
   
  $path ='/data/www/bbs/source';  
  $outfile = 'file.md5';  
  get_file_md5($path, $outfile);  
   
  function get_file_md5($path, $outfile)  
  {  
    $path = rtrim($path, '/');  
    if(function_exists('scandir'))  
    {  
      $files = scandir($path);  
      foreach($files as $v)  
      {  
        if($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: There are two spaces between the generated md5 value and the file, otherwise the error will be as follows

 Copy code The code is as follows: md5sum: file1.md5: no properly formatted MD5 checksum lines found

Let’s do it more simply, use the find command of Linux to get it done in one sentence
Code:

  find /data/www/bbs/source -type f -print0 | xargs -0 md5sum > file2.md5 

Test

  md5sum -c file1.md5 
  md5sum -c file2.md5  

As shown in the picture

This outputs all the test results to the screen. If the last one displays a message like md5sum: WARNING: 2 of 1147 computed checksums did NOT match, it means that 2 of the total 1147 are inconsistent
Then we can

  md5sum -c file1.md5 | grep FAILED 

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

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