Unix / Linux: Remove duplicate lines from a text file using awk or perl

Unix / Linux: Remove duplicate lines from a text file using awk or perl
I have a text file with exact duplicates of lines. I need to remove all those duplicates lines and preserves the order too on Linux or Unix-like system. How do I delete duplicate lines from a text file? You can use Perl or awk or Python to delete all duplicate lines from a text file […]

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