git-blame(1)
============

NAME
----
git-blame - Show what revision and author last modified each line of a file

SYNOPSIS
--------
'git-blame' [-c] [-l] [-t] [-f] [-n] [-p] [-S <revs-file>] [--] <file> [<rev>]

DESCRIPTION
-----------

Annotates each line in the given file with information from the revision which
last modified the line. Optionally, start annotating from the given revision.

This report doesn't tell you anything about lines which have been deleted or
replaced; you need to use a tool such as gitlink:git-diff[1] or the "pickaxe"
interface briefly mentioned in the following paragraph.

Apart from supporting file annotation, git also supports searching the
development history for when a code snippet occured in a change. This makes it
possible to track when a code snippet was added to a file, moved or copied
between files, and eventually deleted or replaced. It works by searching for
a text string in the diff. A small example:

-----------------------------------------------------------------------------
$ git log --pretty=oneline -S'blame_usage'
5040f17eba15504bad66b14a645bddd9b015ebb7 blame -S <ancestry-file>
ea4c7f9bf69e781dd0cd88d2bccb2bf5cc15c9a7 git-blame: Make the output
-----------------------------------------------------------------------------

OPTIONS
-------
-c, --compatibility::
	Use the same output mode as gitlink:git-annotate[1] (Default: off).

-l, --long::
	Show long rev (Default: off).

-t, --time::
	Show raw timestamp (Default: off).

-S, --rev-file <revs-file>::
	Use revs from revs-file instead of calling gitlink:git-rev-list[1].

-f, --show-name::
	Show filename in the original commit.  By default
	filename is shown if there is any line that came from a
	file with different name, due to rename detection.

-n, --show-number::
	Show line number in the original commit (Default: off).

-p, --porcelain::
	Show in a format designed for machine consumption.

-h, --help::
	Show help message.


THE PORCELAIN FORMAT
--------------------

In this format, each line is output after a header; the
header at the minumum has the first line which has:

- 40-byte SHA-1 of the commit the line is attributed to;
- the line number of the line in the original file;
- the line number of the line in the final file;
- on a line that starts a group of line from a different
  commit than the previous one, the number of lines in this
  group.  On subsequent lines this field is absent.

This header line is followed by the following information
at least once for each commit:

- author name ("author"), email ("author-mail"), time
  ("author-time"), and timezone ("author-tz"); similarly
  for committer.
- filename in the commit the line is attributed to.
- the first line of the commit log message ("summary").

The contents of the actual line is output after the above
header, prefixed by a TAB. This is to allow adding more
header elements later.

SEE ALSO
--------
gitlink:git-annotate[1]

AUTHOR
------
Written by Fredrik Kuivinen <freku045@student.liu.se>.

GIT
---
Part of the gitlink:git[7] suite