Tip: Using dig to Show Nameservers

Rai    Linux     domains, Linux, name servers, perl, script, Tips

If the need to scan a list of domains arises, be it one or one hundred, I have one handy Perl script that will list all nameservers of a domain. This script uses the command dig, and filters and lists the result. Do note that Perl must be installed to do this script.

# vi mx_checker.pl

#!/usr/bin/perl

$file=$ARGV[0];
chomp($file);

@list = `cat $file`;

foreach $domain(@list) {
chomp($domain);
$ns = `dig ns $domain +short`;
chomp($ns);
$ns =~s/\n/\t/g;
print “$domain\t$ns\n”;
}

To make the script executable, change the permissions:

# chmod 700 mx_checker.pl

Then build the list of domains by listing it on a text file, one domain per file.

# vi domains.txt

google.com
yahoo.com
usautoparts.com

Now that the script and domain list is ready, it is time to execute the script:

# ./mx_checker.pl domains.txt

The nameservers will then be listed and can be piped to a text file, which can be exported to a spreadsheet as tab-separated values.

# ./mx_checker.pl domains.txt >> nameservers.xls

Linux Tip: Reset Root Password

Rai    Linux     fedora, Linux, password, red hat, reset password, root, Tips, user

How to reset root password?

If you are as forgetful as I am, you have probably forgotten what password you have set for root user. Today, I am going to teach you a little tip on how to reset the root password.
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Google Cheat Sheets

Rai    News     cheat sheet, command, google, Tips

If you are interested in Google domains, services or search operators, then get the Google Cheat Sheet. This PDF file contains the extensive list of thing that I am sure everyone wants to know.

Download the cheat sheet PDF here or view the screenshots:

Cheat Sheet Page 1

Cheat Sheet Page 2