On Tue, Jul 03, 2018 at 04:51:52PM -0500, Taylor Blau wrote:

> diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
> index 0de3493b80..be13fc3253 100644
> --- a/Documentation/git-grep.txt
> +++ b/Documentation/git-grep.txt
> @@ -17,7 +17,7 @@ SYNOPSIS
>          [-l | --files-with-matches] [-L | --files-without-match]
>          [(-O | --open-files-in-pager) [<pager>]]
>          [-z | --null]
> -        [-c | --count] [--all-match] [-q | --quiet]
> +        [ -o | --only-matching ] [-c | --count] [--all-match] [-q | --quiet]
>          [--max-depth <depth>]
>          [--color[=<when>] | --no-color]
>          [--break] [--heading] [-p | --show-function]
> @@ -201,6 +201,10 @@ providing this option will cause it to die.
>       Output \0 instead of the character that normally follows a
>       file name.
> 
> +-o::
> +--only-matching::
> +  Output only the matching part of the lines.
> +

Putting myself into the shoes of a naive reader, I have to wonder what
happens when there are multiple matching parts on the same line. I know
the answer from your commit message, but maybe that should be covered
here? Maybe:

  Output only the matching part of the lines. If there are multiple
  matching parts, each is output on a separate line.

-Peff

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