- publishing free software manuals
Comparing and Merging Files with GNU diff and patch
by David MacKenzie, Paul Eggert, and Richard Stallman
Paperback (6"x9"), 120 pages
ISBN 0954161750
RRP £12.95 ($19.95)

"Well packaged... the quality of information is excellent" --- Linux User and Developer Magazine (Issue 36, Feb 2004) Get a printed copy>>>

2.3.2 Unified Format

The unified output format is a variation on the context format that is more compact because it omits redundant context lines. To select this output format, use the -U lines, --unified[=lines], or -u option. The argument lines is the number of lines of context to show. When it is not given, it defaults to three.

At present, only GNU diff can produce this format and only GNU patch can automatically apply diffs in this format. For proper operation, patch typically needs at least three lines of context.

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