git diff displays colors incorrectly
遇到几次了，git status颜色能正常显示，git log、git diff却是乱码，每次都去查找解决方法[1]，记下之。
You're seeing the escape sequences that tell the terminal to change colors displayed with the escape character shown as ESC, whereas the desired behavior would be that the escape sequences have their intended effect.
Commands such as git diff and git log pipe their output into a pager, less by default. Git tries to tell less to allow control characters to have their control effect, but this isn't working for you.
If less is your pager but you have the environment variable LESS set to a value that doesn't include -r or -R, git is unable to tell less to display colors. It normally passes LESS=-FRSX, but not if LESSis already set in the environment. A fix is to explicitly pass the -R option to tell less to display colors when invoked by git:
git config --global core.pager 'less -R'
If less isn't your pager, either switch to less or figure out how to make your pager display colors.
If you don't want git to display colors when it's invoking a pager, set color.ui to auto instead of true.
参考资料
[1] http://unix.stackexchange.com/questions/64927/git-diff-displays-colors-incorrectly