How to replace a random IP-address in a file (Perl, Windows)

To replace a random IP address in a file using Perl on Windows, you can use regular expressions and the File::Temp module to generate a temporary file. Here's an example script:

perlCopy code
use strict;

use warnings;

use File::Temp qw(tempfile);



# File path to perform the replacement

my $file_path = "path/to/file.txt";



# Generate a temporary file

my ($temp_fh, $temp_file) = tempfile();



# Open the original file for reading

open(my $input_fh, '<', $file_path) or die "Failed to open file: $!";



# Open the temporary file for writing

open(my $output_fh, '>', $temp_file) or die "Failed to create temporary file: $!";



# Pattern to match IP address

my $ip_pattern = qr/\b(?:\d{1,3}\.){3}\d{1,3}\b/;



# Replace IP address with a new random IP

while (my $line = <$input_fh>) {

    $line =~ s/$ip_pattern/random_ip_address()/eg;

    print $output_fh $line;

}



# Close file handles

close($input_fh);

close($output_fh);



# Replace the original file with the temporary file

rename($temp_file, $file_path) or die "Failed to replace file: $!";



# Function to generate a random IP address

sub random_ip_address {

    return join('.', map int(rand(256)), 1..4);

}

In this example, the script reads the input file line by line and uses the s/// operator with the /e modifier to evaluate the replacement as Perl code. The random_ip_address() function generates a random IP address. The script creates a temporary file to write the modified content. Once the modification is complete, it replaces the original file with the temporary file.

Please ensure that you have Perl and the required modules installed (File::Temp) before running the script. Adjust the file path and the regular expression pattern ($ip_pattern) according to your specific needs.