Everything in Linux speaks text. Configuration files, log output, command results, user databases — they're all plain-text streams. The RHCSA expects you to fluently view, slice, combine, compare, and transform text from the command line. You won't open a GUI editor — you'll pipe commands together to answer questions like "how many lines are in this file?", "what do the last 20 lines of this log say?", or "what changed between these two configs?" Master the eight core text commands — cat, head, tail, wc, tee, diff, sort, and cut — and you can interrogate any file on the system in seconds.
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