OSX Ruby Gems Add to ruby path?

Question

I am just starting to learn ruby. It seems that the default gems install path is not part of Ruby. Is this normal behavior? How can I set the default ruby path? Example:

[11:53:33]wuntee:/Library/Ruby/Gems/1.8/gems/packetfu-1.0.0/examples$ sudo ruby arphood.rb 
Fetching the oui.txt from IEEE, it'll be a second. Avoid this with arphood.rb <filename>.
arphood.rb:30:in `require': no such file to load -- packetfu (LoadError)
    from arphood.rb:30:in `arp_everyone'
    from arphood.rb:51

As you can see packetfu is installed in /Library/Ruby/Gems/1.8/gems/, but ruby cant find it...

On a side note please check out "Ruby Version Manager": rvm.beginrescueend.com It will make your Ruby experience a lot more fun and less painful! — Himanshu
– Himanshu, Commented Oct 7, 2010 at 1:06

hellvinz · Accepted Answer · 2010-10-06 17:59:03Z

4

that's because you're not in the directory where packetfu.rb file lies and there's no require 'rubygems' to add the gems paths in your script

answered Oct 6, 2010 at 17:59

hellvinz

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2 Comments

wuntee Over a year ago

what do you mean by "and there's no require 'rubygems' to add the gems paths in your script" - again, new to ruby (1 hour into it)

hellvinz Over a year ago

oups sorry i've been a little quick :) In order to have the gems working a script must include require 'rubygems'. This will add the gems path to your ruby load path. otherwise you just have standard ruby load path

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