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Top Forums Shell Programming and Scripting How to compare multiple files in UNIX? Post 302930870 by penqueen on Thursday 8th of January 2015 08:35:02 AM
Old 01-08-2015
Consider like you have below four files:
Code:
file1.txt - 1 2 3
file2.txt - 4 5 6
file3.txt - 6 7 8 
file4.txt - 9 10 11

1. Sort all the files using SORT
2. Compare file1.txt and file2.txt using DIFF -- no contents were same, now merge these two files say new_file1.txt
3. Compare new_file1.txt with file3.txt as like above -- one content is matched so it will return the value as '6', use SED / AWK to remove that value from file3.txt and merge the remaining contents with new_file1.txt
4. Now finally, compare file4.txt with new_file1.txt -- no contents matched as per the example shown above.

You can try to code for above logic and still if you have doubts with the codes, provide your progress we can help you out.

This will work only if you're having limited no. of files, incase if you wanna to compare 40files then you will to try for various logic like using functions in shell scripting etc.
 

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PHAR.EXTRACTTO(3)							 1							 PHAR.EXTRACTTO(3)

Phar::extractTo - Extract the contents of a phar archive to a directory

SYNOPSIS
public bool Phar::extractTo (string $pathto, [string|array $files], [bool $overwrite = false]) DESCRIPTION
Note This method requires the php.ini setting phar.readonly to be set to 0 in order to work for Phar objects. Otherwise, a PharException will be thrown. Extract all files within a phar archive to disk. Extracted files and directories preserve permissions as stored in the archive. The optional parameters allow optional control over which files are extracted, and whether existing files on disk can be overwritten. The sec- ond parameter files can be either the name of a file or directory to extract, or an array of names of files and directories to extract. By default, this method will not overwrite existing files, the third parameter can be set to true to enable overwriting of files. This method is similar to ZipArchive.extractTo(3). PARAMETERS
o $pathto - Path within an archive to the file to delete. o $files - The name of a file or directory to extract, or an array of files/directories to extract o $overwrite - Set to TRUE to enable overwriting existing files RETURN VALUES
returns TRUE on success, but it is better to check for thrown exception, and assume success if none is thrown. ERRORS
/EXCEPTIONS Throws PharException if errors occur while flushing changes to disk. EXAMPLES
Example #1 A Phar.extractTo(3) example <?php try { $phar = new Phar('myphar.phar'); $phar->extractTo('/full/path'); // extract all files $phar->extractTo('/another/path', 'file.txt'); // extract only file.txt $phar->extractTo('/this/path', array('file1.txt', 'file2.txt')); // extract 2 files only $phar->extractTo('/third/path', null, true); // extract all files, and overwrite } catch (Exception $e) { // handle errors } ?> SEE ALSO
PharData.extractTo(3). PHP Documentation Group PHAR.EXTRACTTO(3)
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