By David MacKenzie
This guide describes tips to evaluate and merge documents utilizing GNU diff and patch. evaluating and merging records is a standard job for software program builders. those courses make it effortless to discover and observe alterations. GNU diff is a part of the GNU diffutils package deal, a whole set of courses for dealing with transformations among teams of records. GNU patch permits those alterations to be dispensed in an effective structure. this can be a published replica of the offical GNU diffutils handbook. It records the entire diffutils courses (diff, cmp, sdiff, diff3), plus GNU patch. GNU diff and patch are unfastened software program. for every replica of this handbook offered, $1 may be donated to the unfastened software program beginning.
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Additional info for Comparing and Merging Files with GNU diff and patch
Rej’. See Chapter 15 [Invoking patch], page 87, for detailed information on the options to patch. 1 Selecting the patch Input Format patch normally determines which diff format the patch ﬁle uses by examining its contents. For patch ﬁles that contain particularly confusing leading text, you might need to use one of the following options to force patch to interpret the patch ﬁle as a certain format of diﬀ. The output formats listed here are the only ones that patch can understand. ‘-c’ ‘--context’ context diﬀ.
Select this method with the ‘-T’ or ‘--initial-tab’ option. 2 Paginating diff Output It can be convenient to have long output page-numbered and timestamped. The ‘-l’ and ‘--paginate’ options do this by sending the diff output through the pr program. Here is what the page header might look like for ‘diff -lc lao tzu’: 2002-02-22 14:20 diff -lc lao tzu Page 1 38 Comparing and Merging Files with GNU diﬀ and patch Chapter 6: diff Performance Tradeoﬀs 39 6 diff Performance Tradeoﬀs gnu diff runs quite eﬃciently; however, in some circumstances you can cause it to run faster or produce a more compact set of changes.
S)’ is equivalent to ‘no lines’ if N (the number of lines in the group in the new ﬁle) is 0, to ‘1 line’ if N is 1, and to ‘%dN lines’ otherwise. 2 Line Formats Line formats control how each line taken from an input ﬁle is output as part of a line group in if-then-else format. For example, the following command outputs text with a one-character change indicator to the left of the text. The ﬁrst character of output is ‘-’ for deleted lines, ‘|’ for added lines, and a space for unchanged lines. The formats contain newline characters where newlines are desired on output.