2.4.2 Detailed Description of Normal Format
The normal output format consists of one or more hunks of differences;
each hunk shows one area where the files differ. Normal format hunks
look like this:
There are three types of change commands. Each consists of a line
number or comma-separated range of lines in the first file, a single
character indicating the kind of change to make, and a line number or
comma-separated range of lines in the second file. All line numbers are
the original line numbers in each file. The types of change commands
- Add the lines in range r of the second file after line l of
the first file. For example, ‘8a12,15’ means append lines 12–15
of file 2 after line 8 of file 1; or, if changing file 2 into file 1,
delete lines 12–15 of file 2.
- Replace the lines in range f of the first file with lines in range
t of the second file. This is like a combined add and delete, but
more compact. For example, ‘5,7c8,10’ means change lines 5–7 of
file 1 to read as lines 8–10 of file 2; or, if changing file 2 into
file 1, change lines 8–10 of file 2 to read as lines 5–7 of file 1.
- Delete the lines in range r from the first file; line l is where
they would have appeared in the second file had they not been deleted.
For example, ‘5,7d3’ means delete lines 5–7 of file 1; or, if
changing file 2 into file 1, append lines 5–7 of file 1 after line 3 of