Ruby not starting on mac os x

Question

when I try to use ruby with the terminal, nothing happens. The last days I've used it and everything worked but it doesn't anymore. I installed rvm and the 1.9.3 version of ruby. It works when I launch a script with ruby myscript.rb, and I tried installing rails but when I type gem install rails I get an error: /Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/bin/gem:4: warning: Insecure world writable dir /Users/romainberger/.rvm/gems/ruby-1.9.3-p194 in PATH, mode 040777

As there is no output I don't know where the problem comes from. Does anybody have an idea?

Thanks

EDIT: rvm info

ruby-1.9.3-p194:

system:
uname:       "Darwin romain.home 11.3.0 Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64"
bash:        "/bin/bash => GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin11)"
zsh:         "/bin/zsh => zsh 4.3.11 (i386-apple-darwin11.0)"

rvm:
version:      "rvm 1.14.1 (master) by Wayne E. Seguin <[e-mail]>, Michal Papis <[e-mail]> [https://rvm.io/]"
updated:      "1 day 11 hours 59 minutes 3 seconds ago"

ruby:
interpreter:  "ruby"
version:      "1.9.3p194"
date:         "2012-04-20"
platform:     "x86_64-darwin11.3.0"
patchlevel:   "2012-04-20 revision 35410"
full_version: "ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.3.0]"

homes:
gem:          "/Users/romainberger/.rvm/gems/ruby-1.9.3-p194"
ruby:         "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194"

binaries:
ruby:         "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/bin/ruby"
irb:          "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/bin/irb"
gem:          "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/bin/gem"
rake:         "/Users/romainberger/.rvm/gems/ruby-1.9.3-p194@global/bin/rake"

environment:
PATH:         "/Users/romainberger/.rvm/gems/ruby-1.9.3-p194/bin:/Users/romainberger/.rvm/gems/ruby-1.9.3-p194@global/bin:/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/bin:/Users/romainberger/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/local/git/bin"
GEM_HOME:     "/Users/romainberger/.rvm/gems/ruby-1.9.3-p194"
GEM_PATH:     "/Users/romainberger/.rvm/gems/ruby-1.9.3-p194:/Users/romainberger/.rvm/gems/ruby-1.9.3-p194@global"
MY_RUBY_HOME: "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194"
IRBRC:        "/Users/romainberger/.rvm/rubies/ruby-1.9.3-p194/.irbrc"
RUBYOPT:      ""
gemset:       ""

gem info gives me:

ERROR:  While executing gem ... (RuntimeError)
Unknown command info

And to launch ruby I just type ruby

Answer 1

To fix the gem warning use:

chmod -R go-w /Users/romainberger/.rvm/

It will recursively remove write right for group and others (keeps write for user).

You can check for RVM related resurces on RVM site: https://rvm.io/