git diff --color-words --no-index a.txt b.txt

git diff --color-words HEAD~4 HEAD~3
git diff --color-words ac238c26 5d449a61

# 首先安装ansi2html
# https://github.com/pixelb/scripts/blob/master/scripts/ansi2html.sh
wget "http://www.pixelbeat.org/scripts/ansi2html.sh" -O ansi2html.sh
chmod +x ansi2html.sh
git diff --color-words HEAD~4 HEAD~3 | ansi2html.sh > docs/diff.html

#!/bin/sh

# Convert ANSI (terminal) colours and attributes to HTML

# Licence: LGPLv2
# Author:
#    http://www.pixelbeat.org/docs/terminal_colours/
# Examples:
#    ls -l --color=always | ansi2html.sh > ls.html
#    git show --color | ansi2html.sh > last_change.html
#    Generally one can use the `script` util to capture full terminal output.
# Changes:
#    V0.1, 24 Apr 2008, Initial release
#    V0.2, 01 Jan 2009, Phil Harnish <philharnish@gmail.com>
#                         Support `git diff --color` output by
#                         matching ANSI codes that specify only
#                         bold or background colour.
#                       P@draigBrady.com
#                         Support `ls --color` output by stripping
#                         redundant leading 0s from ANSI codes.
#                         Support `grep --color=always` by stripping
#                         unhandled ANSI codes (specifically ^[[K).
#    V0.3, 20 Mar 2009, http://eexpress.blog.ubuntu.org.cn/
#                         Remove cat -v usage which mangled non ascii input.
#                         Cleanup regular expressions used.
#                         Support other attributes like reverse, ......