You don t have write permissions for the Library Ruby Gems 2 3 0 directory mac user

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below is what I need to do   To run the specs  you ll need to install RSpec  First  run gem install bundler in the root directory of your project  Then  run bundle install  To run a single spec file  run a command like this  bundle exec rspec spec 00 hello spec rb  To run all of the specs at once  run bundle exec rspec   So  I typed gem install bundler in Terminal  and got the error   You don t have write permissions for the  Library Ruby Gems 2 3 0 directory   and this was in the project file in atom source  quot https   rubygems org quot  gem  quot rspec quot    quot   gt  3 2 0 quot   My question is  It seems like terminal is giving me the response because I m not supposed to change anything on ruby  and I need to bundle install inside of atom  Could anyone tell me how to use atom or run anything in atom

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If you don t want to run sudo then install ruby using homebrew brew install ruby export GEM HOME  quot  HOME  gem quot  gem install rails  You may want to add export GEM HOME  quot  HOME  gem quot  to your    bash profile or  zshrc if you re using zsh Note  RubyGems keeps old versions of gems  so feel free to do some cleaning after updating  gem cleanup

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This worked for me on Mac     sudo chown -R   whoami    brew --prefix

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Try this  sudo gem install cocoapods --user-install  Worked for me

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Worked for me using the parameter --user-install running following command   gem install name of gem --user-install   Then he started to fetch and install it   Edit  There was one gem I still could not install  it required the Ruby h headers of the Ruby development kit or something   then I tried the different version managers  but somehow that still did not really work as it was stated in the documentations how to just install and switch  it did just not switch the versions   Then I removed all the installed version managers and installed afterwards with brew install ruby the latest version and did set the PATH variable  too   It will be mentioned after the installation of ruby from brew   which worked

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Update  I ve since written a very detailed explanation of the various ways you can install Ruby gems on a Mac  My original recommendation to use a script still stands  but my article goes into more detail  https   www moncefbelyamani com the-definitive-guide-to-installing-ruby-gems-on-a-mac  You are correct that macOS won t let you change anything with the Ruby version that comes installed with your Mac  However  it s possible to install gems like bundler using a separate version of Ruby that doesn t interfere with the one provided by Apple  Using sudo to install gems  or changing permissions of system files and directories is strongly discouraged  even if you know what you are doing  Can we please stop providing this bad advice  Here s a detailed article I wrote showing how sudo gem install can wipe out your computer  https   www moncefbelyamani com why-you-should-never-use-sudo-to-install-ruby-gems  The solution involves two main steps   Install a separate version of Ruby that does not interfere with the one that came with your Mac  Update your PATH such that the location of the new Ruby version is first in the PATH  Some tools do this automatically for you  If you re not familiar with the PATH and how it works  read my guide   There are several ways to install Ruby on a Mac  The best way that I recommend  and that I wish was more prevalent in the various installation instructions out there  is to use an automated script that will set up a proper Ruby environment for you  This drastically reduces the chances of running into an error due to inadequate instructions that make the user do a bunch of stuff manually and leaving it up to them to figure out all the necessary steps  The other route you can take is to spend extra time doing everything manually and hoping for the best  First  you will want to install Homebrew  which installs the prerequisite command line tools  and makes it easy to install other necessary tools  Then  the two easiest ways to install a separate version of Ruby are  If you would like the flexibility of easily switching between many Ruby versions  RECOMMENDED  Choose one of these four options   chruby and ruby-install - my personal recommendations and the ones that are automatically installed by my script  These can be installed with Homebrew   brew install chruby ruby-install   rbenv - can be installed with Homebrew  RVM  asdf   If you chose chruby and ruby-install  you can then install the latest Ruby like this  ruby-install ruby  Once you ve installed everything and configured your  zshrc or  bash profile according to the instructions from the tools above  quit and restart Terminal  then switch to the version of Ruby that you want  In the case of chruby  it would be something like this  chruby 2 7 2  Whether you need to configure  zshrc or  bash profile depends on which shell you are using  If you re not sure  read this guide  https   www moncefbelyamani com which-shell-am-i-using-how-can-i-switch  If you know for sure you don t need more than one version of Ruby at the same time  besides the one that came with macOS   Install ruby with Homebrew   brew install ruby  Then update your PATH by running  replace 2 7 0 with your newly installed version   echo  export PATH  quot  usr local opt ruby bin  usr local lib ruby gems 2 7 0 bin  PATH quot    gt  gt     zshrc  Then  quot refresh quot  your shell for these changes to take effect  source    zshrc  Or you can open a new terminal tab  or quit and restart Terminal  Replace  zshrc with  bash profile if you are using Bash  If you re not sure which shell you are using  read this guide  https   www moncefbelyamani com which-shell-am-i-using-how-can-i-switch  To check that you re now using the non-system version of Ruby  you can run the following commands  which ruby  It should be something other than  usr bin ruby ruby -v  It should be something other than 2 6 3 if you re on macOS Catalina  As of today  2 7 2 is the latest Ruby version  Once you have this new version of Ruby installed  you can now install bundler  or any other gem   gem install bundler

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If you have installed ruby separately and installed ruby using rbenv rvm you budler might point to different versions   try   gem env home   and  ruby -v   both should point to same version check you have installed ruby using rbenv rvm  If so delete the ruby version you installed separately   In order for gem to work  you must invoke rbenv   rbenv shell  lt ruby version gt     and   rbenv global  lt ruby version gt    I am not sure how RVM works  Let me know if this works

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A different installation of ruby should be used  I use rbenv for that purpose    install your version of ruby   rbenv install 2 0 0-p247    modify  ruby version on current directory   rbenv local 2 0 0-p247    proceed installing gems   gem install bundler  Disclamer  I am not a ruby person  This worked for me and if you are a ruby expert and see things to change in this answer  please  go ahead or comment

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Solution for Mac   Install update RVM with last ruby version   curl -sSL https   get rvm io   bash -s stable Install bundler  gem install bundler     after this two commands  sudo  gem install      started to work

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As  idleberg mentions  on Mac OS  it is best to install rbenv to avoid permissions errors when using manually installed ruby  Installation   brew update   brew install rbenv  Add the following in  bashrc file  eval  quot   rbenv init -  quot   Now  we can look at the list of ruby versions available for install   rbenv install -l  Install version 2 3 8 for example   rbenv install 2 3 8  Now we can use this ruby version globally   rbenv global 2 3 8  Finally run   rbenv rehash    which ruby  Users myuser  rbenv shims ruby   ruby -v ruby 2 3 7p456  2018-03-28 revision 63024   x86 64-darwin17   Go for it Now install bundler   gem install bundler  All done

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It s generally recommended to use a version manager like rbenv or rvm  Otherwise  installed Gems will be available as root for other users   If you know what you re doing  you can use sudo gem install

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I m using Mojave with rbenv  this solution works for me     vi    bash profile   Add this line into the file   if which rbenv  gt   dev null  then eval    rbenv init -    fi

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Simply doing sudo gem uninstall cocoapods worked for me

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TL DR In several occasions  I ve solved this kind of errors by just closing my terminal session and opening a new one before retrying the failing command  Long explanation In some SOs  such as MacOS  there is already a pre-installed  system-wide version of ruby  If you are using a version manager  such as rbenv or asdf  they work by playing with the environment of your current session so that the relevant commands point to the binaries installed by the version manager  When installing a new binary  the version manager installs it in a special location  usually somewhere under the user s home directory  It then configures everything in your PATH so that you get the freshly installed binaries when you issue a command  instead of the ones that came with your system  However  if you don t restart the session  there are other ways of getting your environment updated  but that s the easiest one  you don t get the new configuration and you will be using the original installation

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I have faced same issue after install macOS Catalina  I had try below command and its working   sudo gem update

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Solution for MAC  run the command sudo gem update      then type your Mac password when prompted

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Run this    rbenv init   Load rbenv automatically by appending   the following to    zshrc   eval    rbenv init -     Follow instructions   in my case add to    zshrc         Also important  Changes only take effect if you reboot your console  Two options   Enter source  lt modified file gt  close and open again

[macos] You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory. (mac user)

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