-bash: find_git_branch: command not found ，终端里的烦人命令，怎么去掉啊

Question

monty@bogon ~ (develop) $ l
-bash: l: command not found
-bash: find_git_branch: command not found
monty@bogon ~ (develop) $ q
-bash: q: command not found
-bash: find_git_branch: command not found
monty@bogon ~ (develop) $ s
-bash: s: command not found
-bash: find_git_branch: command not found

这到底是怎么回事啊
我在.bash_profile 和 .bashrc 这两个文件里先后清空后，又还原回去，还是不行，之前想着在终端中加git分支的显示，在网上找的教程，虽然加上了，但是出现了这个烦人的提示，输入一条命令就显示这个，有什么办法去除掉呢，

Answer 1

分支显示可以用 zsh, 终极 shell