如何在php文件或perl文件中编写linux grep、sed、diff语句

Question

I want to compare 2 text files using Diff, grep, and sed.

First, How to write linux grep, sed, diff sentences in a php file or in a perl file?

how to write this diff in php or perl:

$ diff C:/Users/User/Desktop/text1.txt C:/Users/User/Desktop/text2.txt > C:/Users/User/Desktop/text3.txt

how to write this sed in php or perl:

$ sed -i -r 's/.{2}//' C:/Users/User/Desktop/text3.txt 

Second, What is better? writing it in PHP file or Perl file? I want to call this script from PHP file.

Thank you.

Edit 1: I try this:

$text_files_path = "C:/inetpub/wwwroot/dbs"; 
$command = ("diff $text_files_path/$OldDbFile $text_files_path/$NewDbFile > $text_files_path/diffFile.txt"); 
exec($command);

it generate the new file in the specified folder but, it is empty!

Answer 1

Try this :

<?php 
    echo exec("sed -i -r 's/.{2}//' C:/Users/User/Desktop/text3.txt"); 
?>