brew doctor Warning: How to add git to PATH?

问题

I installed Homebrew on OS X El Capitan. In the last steps of the installation I was supposed to install git with

brew install git

which was fine. Now if I run 'brew doctor' this happens:

$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Git could not be found in your PATH.
Homebrew uses Git for several internal functions, and some formulae use Git
checkouts instead of stable tarballs. You may want to install Git:
  brew install git

If I run 'brew install git' again, I get:

$ brew install git 
Warning: git-2.7.4 already installed

So needless to say my git version is 2.7.4. 'brew update' throws:

$ brew update
Warning: git-2.7.4 already installed
Error: Git must be installed and in your PATH!

Question: How do I fix my PATH so git can be found in my PATH and 'brew doctor' results in 'Your system is ready to brew'?

---

Additional Information:

• which -a git results in:

  $ which -a git
  /usr/local/bin/git
  /usr/local/bin/git
  /usr/bin/git
  

• I tried a lot of potential fixes, meanwhile I executed:

  echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bash_profile
  

  My ~/.bash_profile now looks like this:

  # Setting PATH for Python 2.7
  # The orginal version is saved in .bash_profile.pysave
  PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
  export PATH=/usr/local/bin:$PATH
  

• When I try to install cask:

  $ brew tap caskroom/cask
  ==> Installing git
  Warning: git-2.7.4 already installed
  Error: Git is unavailable
  

• brew config:

  $ brew config
  HOMEBREW_VERSION: 0.9.5
  ORIGIN: (none)
  HEAD: (none)
  Last commit: never
  HOMEBREW_PREFIX: /usr/local
  HOMEBREW_REPOSITORY: /usr/local
  HOMEBREW_CELLAR: /usr/local/Cellar
  HOMEBREW_BOTTLE_DOMAIN: https://homebrew.bintray.com
  CPU: quad-core 64-bit haswell
  OS X: 10.11.4-x86_64
  Xcode: 7.3
  CLT: 7.3.0.0.1.1457485338
  Clang: 7.3 build 703
  X11: N/A
  System Ruby: 2.0.0-p648
  Perl: /usr/bin/perl
  Python: /usr/local/bin/python => /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/bin/python2.7
  Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
  Java: 1.8.0_40
  

EDIT: Added cask to additional information.

EDIT2: Added brew config and added brew doctor prefix

回答1:

this fixed my problem:

cd /usr/local/Library/Homebrew
git pull origin master

after that I ran again

brew update && brew upgrade

回答2:

For me this was caused by missing xcode tools, fixed by xcode-select --install.

Several other suggested fixes including git fetch in the brew directory and/or changing git core.autocrlf did not fix this.

In more detail I uninstalled git from brew brew uninstall --force git, but Apple's own git then didn't work (/usr/bin/git --version reported missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun).

Running brew doctor suggested running xcode-select --install, I ran this and it fixed Apple's git, and also fixed brew. (Possible to then reinstall git via brew brew install git.)

回答3:

Simply run:

export PATH=/usr/local/bin:$PATH

Your PATH variable should look something like

PATH="/usr/bin:/usr/local/bin"

回答4:

I found the solution to my problem. It was caused by a wrong fileformat of /usr/local/Library/ENV/scm/git:

$ /usr/local/Library/ENV/scm/git --version
-bash: /usr/local/Library/ENV/scm/git: /bin/sh^M: bad interpreter: No such file or directory

So I edited the fileformat:

$ vi /usr/local/Library/ENV/scm/git

Press 'ESC', write :set fileformat=unix, Press 'Enter', write :wq!.

That fixed it for me.

回答5:

I ran into the same symptom when tyring to run brew update.

In my case problem was caused by have a bash variable of GIT set (to a directory). So the solution was to unset it for the brew command

$ GIT= brew update

回答6:

If you're like me: using macOS El Capitan and don't have /usr/local/Library/ENV/scm/git, here's what you can do.

cd /usr/local/
# The folder where you've installed Homebrew
git config --list --local

Look for: core.autoxrlf=false

If don't see it run: git config --local core.autocrlf false

Then run:

git fetch origin
git reset --hard origin/master
brew update

回答7:

Likely problem with libintl.8.dylib as in many other similar issues:

locate libintl.8.dylib

if /gettext//libintl.*.dylib exists

brew link -f gettext

go to (depending on version)

cd /usr/local/Homebrew 
cd /usr/local/Library/Homebrew 

and execute (make sure you're in .../Homebrew directory)

git pull origin master
rm -fr ".git/rebase-apply"
brew update && brew upgrade

this last will took some time, but afterwards everything should work fine.

来源：https://stackoverflow.com/questions/36237537/brew-doctor-warning-how-to-add-git-to-path