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Detailed Description of diff3 Normal Format

Each hunk begins with a line marked ====. Three-way hunks have plain ==== lines, and two-way hunks have 1, 2, or 3 appended to specify which of the three input files differ in that hunk. The hunks contain copies of two or three sets of input lines each preceded by one or two commands identifying where the lines came from.

Normally, two spaces precede each copy of an input line to distinguish it from the commands. But with the -T or --initial-tab option, diff3 uses a tab instead of two spaces; this lines up tabs correctly. See Tabs, for more information.

Commands take the following forms:

file:la
This hunk appears after line l of file file, and contains no lines in that file. To edit this file to yield the other files, one must append hunk lines taken from the other files. For example, 1:11a means that the hunk follows line 11 in the first file and contains no lines from that file.
file:rc
This hunk contains the lines in the range r of file file. The range r is a comma-separated pair of line numbers, or just one number if the range is a singleton. To edit this file to yield the other files, one must change the specified lines to be the lines taken from the other files. For example, 2:11,13c means that the hunk contains lines 11 through 13 from the second file.

If the last line in a set of input lines is incomplete (see Incomplete Lines), it is distinguished on output from a full line by a following line that starts with \.