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#regex (2)

grep — Pattern Search

Search files and streams using fixed strings, extended regex, or PCRE. Covers all major flags, context, recursive search, and pipeline patterns.
grep regex search text-processing cli pipes

sed — Stream Editor

Non-interactive text transformation. Substitution, deletion, insertion, address ranges, in-place editing, and multi-line patterns with practical recipes.
sed stream-editor text-processing regex cli scripting