Linux's file permissions are over 50 years old, and three letters still decide who can touch every file on your PC
· xda-developers.com · popularity 20/100 · 0 similar stories today · Anthropology & Archaeology (Discovery & Research)

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Summary
You can see them in action with a single console command.
Found in: XDA Developers. Rating basis: single outlet; outlet tier 2 (unlisted); 1 feeds; feed position 4.