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2.3.2.1 Detailed Description of Unified Format

The unified output format starts with a two-line header, which looks like this:

 
--- from-file from-file-modification-time
+++ to-file to-file-modification-time

The time stamp looks like ‘2002-02-21 23:30:39.942229878 -0800’ to indicate the date, time with fractional seconds, and time zone.

You can change the header's content with the ‘--label=label’ option; see See section Showing Alternate File Names.

Next come one or more hunks of differences; each hunk shows one area where the files differ. Unified format hunks look like this:

 
@@ from-file-range to-file-range @@
 line-from-either-file
 line-from-either-file

The lines common to both files begin with a space character. The lines that actually differ between the two files have one of the following indicator characters in the left print column:

+

A line was added here to the first file.

-

A line was removed here from the first file.


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