Uninstall all installed gems in OSX

Question

There are instances where I would like to revert and uninstall all previous gem installations   For instance  I needed to assist a friend migrate their rails development machine to use RVM   As they had been previously using the system-wide gem  he was experiencing many headaches when working with multiple projects   Essentially  he was the poster-child for an RVM convert   How can I elegantly uninstall all of the gems on his OSX system

User · Answer

When trying to remove gems installed as root, xargs seems to halt when it encounters an error trying to uninstall a default gem:

sudo gem list | cut -d" " -f1 | xargs gem uninstall -aIx
# ERROR:  While executing gem ... (Gem::InstallError)
#    gem "test-unit" cannot be uninstalled because it is a default gem

This won't work for everyone, but here's what I used instead:

sudo for gem (`gem list | cut -d" " -f1`); do gem uninstall $gem -aIx; done

User · Answer

The only command helped me to cleanup all gems and ignores default gems  which can t be uninstalled  for x in  gem list --no-versions   do gem uninstall  x -a -x -I  done

User · Answer

First make sure you have at least gem version 2 1 0   gem update --system gem --version   2 6 4   To uninstall simply run   gem uninstall --all   You may need to use the sudo command    sudo gem uninstall --all

User · Answer

If you are using Rubygems version 2 1 0 or later  you can try  gem uninstall --all

User · Answer

gem list --no-version   grep -v -e  psych  -e  rdoc  -e  openssl  -e  json  -e  io-console  -e  bigdecimal    xargs sudo gem uninstall -ax   grep here is excluding default gems  All other gems will be uninstalled  You can also precede it with sudo in case you get permission issues

User · Answer

You could also build out a new Gemfile and run bundle clean --force  This will remove all other gems that aren t included in the new Gemfile

User · Answer

Rubygems    2 1 0  gem uninstall -aIx   If Terminal returns below error  ERROR   While executing gem      Gem  FilePermissionError  You don t have write permissions for the  Library Ruby Gems 2 0 0 directory    Then write above command as below  sudo gem uninstall -aIx   And enter your mac os account password Done

User · Answer

Rubygems    2 1 0  gem uninstall -aIx   a removes all versions I ignores dependencies x includes executables  Rubgems  lt  2 1 0  for i in  gem list --no-versions   do gem uninstall -aIx  i  done

User · Answer

If you like doing it using ruby   ruby -e   gem list  split      each    line  puts  gem uninstall -Iax   line split      0    unless line strip empty       Cheers

User · Answer

Use either    gem list --no-version   xargs gem uninstall -ax   or    sudo gem list --no-version   xargs sudo gem uninstall -ax   Depending on what you want  you may need to execute both  because  gem list  and  sudo gem list  provide independent lists   Do not mix a normal  gem list  with a sudo-ed  gem uninstall  nor the other way around otherwise you may end up uninstalling sudo-installed gems  former  or getting a lot of errors  latter

User · Answer

I did that not too long ago  same poster-child RVM switcher situation    gem list   cut -d    -f1   sudo xargs gem uninstall -Iax   Takes the list of all gems  incl  version stuff   cuts it to keep only the gem name  then uninstalls all versions of such gems   The sudo is only useful if you had gems installed system-wide  and should not be included unless necessary

User · Answer

A slighest different version  skipping the cut step  taking advantage of the  --no-version  option   gem list --no-version  xargs gem uninstall -ax   Since you are removing everything  I don t see the need for the  I  option  Whenever the gem is removed  it s fine

User · Answer

And for those of you who are here because you want to remove all gems with a certain prefix  ahem I m looking at you aws-sdk   you can run something like this    gem list --no-version   grep  aws-sdk-    xargs gem uninstall -aIx   Obviously put in your query instead of aws-sdk-  You need the -I in there to ignore dependencies   Adopted form Ando s earlier answer

[ruby] Uninstall all installed gems, in OSX?

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