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Detailed Description of Context Format

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

*** from-file from-file-modification-time
--- to-file to-file-modification time

You can change the header's content with the `-L label' or `--label=label' option; see section Showing Alternate File Names.

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

***************
*** from-file-line-range ****
  from-file-line
  from-file-line...
--- to-file-line-range ----
  to-file-line
  to-file-line...

The lines of context around the lines that differ start with two space characters. The lines that differ between the two files start with one of the following indicator characters, followed by a space character:

`!'
A line that is part of a group of one or more lines that changed between the two files. There is a corresponding group of lines marked with `!' in the part of this hunk for the other file.
`+'
An "inserted" line in the second file that corresponds to nothing in the first file.
`-'
A "deleted" line in the first file that corresponds to nothing in the second file.

If all of the changes in a hunk are insertions, the lines of from-file are omitted. If all of the changes are deletions, the lines of to-file are omitted.


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