Tengo 2 versiones de rubíes usando RVM y estoy tratando de eliminar todas mis gemas que en este rubíversion 1.8.7-p302

Primero probé esto pero me salió un error

➜  ~  gem list | cut -d" " -f1 | xargs gem uninstall -aIx
Successfully uninstalled actionmailer-2.3.5
Successfully uninstalled actionmailer-2.3.18
Successfully uninstalled actionpack-2.3.5
Successfully uninstalled actionpack-2.3.18
Successfully uninstalled activerecord-2.3.5
Successfully uninstalled activerecord-2.3.18
Successfully uninstalled activeresource-2.3.5
Successfully uninstalled activeresource-2.3.18
Successfully uninstalled activesupport-2.3.5
Successfully uninstalled activesupport-2.3.18
Removing bundle
Successfully uninstalled bundler-1.3.5
ERROR:  While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d bundler-unload`

Entonces intenté esto también un error

➜  ~  gem list --no-version | xargs gem uninstall -aIx
zsh: correct 'gem' to '.gem' [nyae]? n
ERROR:  While executing gem ... (Gem::InstallError)
    cannot uninstall, check `gem list -d bundler`

Mi lista de gemas:

➜  ~  gem list                                                                                 

*** LOCAL GEMS ***

bundler (1.3.5)
bundler-unload (1.0.1)
declarative_authorization (0.5.1)
fattr (2.2.1)
i18n (0.4.2)
mysql (2.9.1, 2.8.1)
rack (1.1.6, 1.0.1)
rails (2.3.18, 2.3.5)
rake (10.1.0, 0.8.7)
rubygems-bundler (1.2.2)
rush (0.6.8)
rvm (1.11.3.8)
session (3.1.0)
sqlite3 (1.3.8)

Actualizar:

He intentado eliminar el ruby ​​1.8.7 y luego lo instalé, pero las gemas aún están allí cuando escribo.

➜  ~  rvm gemset empty default
Are you SURE you wish to remove the installed gems for gemset 'ruby-1.8.7-p302' (/home/dexter/.rvm/gems/ruby-1.8.7-p302)?
(anything other than 'yes' will cancel) > yes
➜  ~  gem list

*** LOCAL GEMS ***

bundler (1.3.5)
bundler-unload (1.0.1)
rake (10.1.0)
rubygems-bundler (1.2.2)
rvm (1.11.3.8)
➜  ~  gem list --no-version | xargs gem uninstall -aIx   
zsh: correct 'gem' to '.gem' [nyae]? n
INFO:  gem "bundler" is not installed
INFO:  gem "bundler-unload" is not installed
INFO:  gem "rake" is not installed
INFO:  gem "rubygems-bundler" is not installed
INFO:  gem "rvm" is not installed

Ahora no puedo instalar rieles de nuevo!

➜  ~  gem rails -v '2.3.5'
ERROR:  While executing gem ... (RuntimeError)
    Unknown command rails