Ack: Searching Cheat Sheet

-i, --ignore-caseIgnore case distinctions in pattern
--[no]smart-caseIgnore case distinctions in pattern, but only if pattern contains no upper caseIgnored if -i is specified.
-v, --invert-matchInvert match: select non-matching lines
-w, --word-regexpForce pattern to match only whole words
-Q, --literalQuote all metacharacters: pattern is literal

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