snippets/old_snippets/remove-common-lines.en.md

title	seo_description	date	draft	snippet_types
remove common lines with comm	How to remove common lines from files using the comm command	2023-05-24T12:52:11+02:00	false	comm

With help of ChatGPT I discovered this unix gem today.

Given two files

main_deck.txt:

1 Abzan Charm
1 Arcane Bombardment
1 Arcane Sanctum
1 Arcane Signet
1 Archmage Emeritus
1 Bant Charm
1 Boros Charm
1 Bring to Light
1 Brokers Charm
1 Brokers Confluence

considering.txt:

1 Abzan Charm
1 Arcane Sanctum
1 Taigam, Ojutai Master
1 Archmage Emeritus
1 Boros Charm
1 Tamanoa
1 Time Wipe
1 Trap Essence
1 Brokers Confluence

running

$ comm -23 <(cat considering.txt | sort) <(cat main_deck.txt | sort)
1 Taigam, Ojutai Master
1 Tamanoa
1 Time Wipe
1 Trap Essence

Returns a list of cards that are unique to the considering.txt.

If your text files are sorted you can skip the <(cat ..) magic.

And yes. I'm using the cli two help build Magic the Gathering Decks!