By David MacKenzie
This guide describes the best way to examine and merge documents utilizing GNU diff and patch. evaluating and merging documents is a typical task 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 adjustments among teams of records. GNU patch permits those alterations to be allotted in a good layout. it is a published replica of the offical GNU diffutils handbook. It files all of the diffutils courses (diff, cmp, sdiff, diff3), plus GNU patch. GNU diff and patch are loose software program. for every replica of this guide bought, $1 might be donated to the loose software program starting place.
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Extra info for Comparing and Merging Files with GNU diff and patch
The printf conversion speciﬁcation can be ‘%d’, ‘%o’, ‘%x’, or ‘%X’, specifying decimal, octal, lower case hexadecimal, or upper case hexadecimal output respectively. After the ‘%’ the following options can appear in sequence: a series of zero or more ﬂags; an integer specifying the minimum ﬁeld width; and a period followed by an optional integer specifying the minimum number of digits. The ﬂags are ‘-’ for left-justiﬁcation, ‘’’ for separating the digit into groups as speciﬁed by the LC_NUMERIC locale category, and ‘0’ for padding with zeros instead of spaces.
You can think of this as subtracting older from yours and adding the result to mine, or as merging into mine the changes that would turn older into yours. This merging is well-deﬁned as long as mine and older match in the neighborhood of each such change. This fails to be true when all three input ﬁles diﬀer or when only older diﬀers; we call this a conﬂict. When all three input ﬁles diﬀer, we call the conﬂict an overlap. diff3 gives you several ways to handle overlaps and conﬂicts. You can omit overlaps or conﬂicts, or select only overlaps, or mark conﬂicts with special ‘<<<<<<<’ and ‘>>>>>>>’ lines.
S’ Silently copy common lines. ‘v’ Verbosely copy common lines. This is the default. The text editor invoked is speciﬁed by the EDITOR environment variable if it is set. The default is system-dependent. Chapter 10: Merging with patch 53 10 Merging with patch patch takes comparison output produced by diff and applies the diﬀerences to a copy of the original ﬁle, producing a patched version. With patch, you can distribute just the changes to a set of ﬁles instead of distributing the entire ﬁle set; your correspondents can apply patch to update their copy of the ﬁles with your changes.
Comparing and Merging Files with GNU diff and patch by David MacKenzie