Remove duplicate lines from text file

This snippet will remove duplicate lines from text file:

awk '!seen[$0]++' filename

It will display the results on screen. If you want your results in a file, do it like this:

awk '!seen[$0]++' filename > new_filename

Source
The GNU Awk User’s Guide

 

By Aleksandar Jakovljević

My name is Aleksandar Jakovljević and I am a web developer from Belgrade, Serbia. I was born in Smederevo, in 1980. I started focusing on web development since late 2003. I am mostly focused on open source web technologies. I specialised in PHP, focusing on Symfony framework, with skills in Drupal and WordPress, too. I worked more than 7 years for art_net studio and 10 years for Computer Rock (former Spoiled Milk). Now I am working on developing industry leading subscription management system as a part of Plenigo team since August 2021. I love the web and everything related to it. The possibility to publish your ideas quickly and make them available to the entire world is what made me decide to pursue a career in web development.

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