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grep: When -w wraps the pattern with boundary groups, use submatch group 2 (the word) for -o output positions instead of group 0 (which includes boundary characters). head: Add --silent as alias for --quiet using the same pattern as readlink. Parse -n value as string to support negative counts (-n -3 = all but last 3 lines). Fix expandObsoleteArgs to not expand -NUM when it follows -n/-c. cat: When -E is active without -v, convert trailing \r before \n to ^M$ to match GNU cat behavior.
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Summary
-woto output only the matched word, not boundary characters. When-wwraps the regex pattern with boundary groups, match positions now come from submatch group 2 (the word) instead of group 0 (the full match including boundary chars).--silentas alias for--quiet(matches GNU coreutils). Implement-n -Nnegative suffix to output all but the last N lines. FixexpandObsoleteArgsto not misinterpret-3as obsolete-NUMsyntax when it follows-n/-c.-Eis active without-v, convert trailing\rbefore\nto^M$to match GNU cat behavior.Test plan
-woaudit tests pass (G-03 variants)--silentalias test passes-n -3negative count test passes-ECRLF tests pass (single line, mid-line CR preserved, multiple CRLF lines)