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#### 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:

    change-command
    < from-file-line
    < from-file-line...
    ---
    > to-file-line
    > to-file-line...

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 are:

`lar`
  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.
`fct`
  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.
`rdl`
  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 file 2.