Rails - Jun 2014 - I am brandnew to this and have a few questions regarding the installation

Hi everybody!

I am founding my own internet business and even though it is not on me to 
code the web application, I set myself the goal to learn Ruby on Rails to 
better understand what our programmer is doing. I tried to install it 
yesterday on my Mac (Macbook Pro 10.9.3) and I got a few error messages 
that I cannot explain. I would very much appreciate your help on that - my 
programmer is on vacation for 3 weeks, otherwise I would have asked him:-)

That's what I did:

1. I downloaded Xcode 5 sucessfully

2. I searched for the Terminal, found it and installed the RVM 
successfully, but it always gave me these messages, which I cannot explain:
sed: 1: "\#^system_type=# { s#^s ...": extra characters at the end of
p
command
sed: 1: "\#^system_type=# { s#^s ...": extra characters at the end of
p
command
sed: 1: "\#^system_name=# { s#^s ...": extra characters at the end of
p
command
sed: 1: "\#^system_name=# { s#^s ...": extra characters at the end of
p
command
sed: 1: "\#^system_name_lowercas ...": extra characters at the end of
p
command
sed: 1: "\#^system_name_lowercas ...": extra characters at the end of
p
command
sed: 1: "\#^system_version=# { s ...": extra characters at the end of
p
command
sed: 1: "\#^system_version=# { s ...": extra characters at the end of
p
command
sed: 1: "\#^system_arch=# { s#^s ...": extra characters at the end of
p
command
sed: 1: "\#^system_arch=# { s#^s ...": extra characters at the end of
p
command

3. I installed Ruby successfully (ruby 2.0.0p451)

4. I tried to update the gem package but it gave me this message, which I 
cannot explain:
Updating installed gems
Updating CFPropertyList
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 
directory.

5. I tried to install Rails 3.2.0 with this command: gem install rails 
--version '~> 3.2.0'. Again, I got an error message
Fetching: multi_json-1.10.1.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 
directory.

Anyone knows what this means and what I can do to finalize the installation?

Thanks so much!
Best,
Hanna


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