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Remove Duplicate In A File

Here’s a Perl script for removing duplicates in a file.

perl -ne 'print unless $dup{$_}++;' input_file > output_file

Domain Sorter

Here’s a Bash and Perl script for sorting domains and subdomains.

Command:

$ cat filename | perl -ple'$_=join".",reverse split/\./' | sort | perl -ple'$_=join".",reverse split/\./'

What’s in the domains.txt?

$ cat domains.txt
domain.com
abc.com
xyz.com
bbb.com
mail.gmail.com
ess.sfss.org
csub.edu
gmail.com

Result:

$ cat domains.txt | perl -ple'$_=join".",reverse split/\./' | sort | perl -ple'$_=join".",reverse split/\./'
abc.com
bbb.com
domain.com
gmail.com
mail.gmail.com
xyz.com
csub.edu
ess.sfss.org

You can also pipe the result to another file.

$ cat filename | perl -ple'$_=join".",reverse split/\./' | sort | perl -ple'$_=join".",reverse split/\./' > output.txt

Source.

Create Image on GCP

Here’s the command to create an image from an existing VM instance. You can create an image from disks, snapshots, images or from a cloud storage file. You can use images you built to launch and restore VM instances, as well as create Instance Templates.

gcloud compute --project=your-project images create your-server --source-disk=your-server --source-disk-zone=us-central1-c

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