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Comparing and Merging Files with GNU diff and patch
by David MacKenzie, Paul Eggert, and Richard Stallman
Paperback (6"x9"), 120 pages
ISBN 0954161750
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2.3.3 Showing Which Sections Differences Are in

Sometimes you might want to know which part of the files each change falls in. If the files are source code, this could mean which function was changed. If the files are documents, it could mean which chapter or appendix was changed. GNU diff can show this by displaying the nearest section heading line that precedes the differing lines. Which lines are "section headings" is determined by a regular expression.

ISBN 0954161750Comparing and Merging Files with GNU diff and patchSee the print edition