Get it from the App Store.
In XCode's Preferences > Downloads you can install command line tools.
This gist assumes:
| #!/usr/bin/env ruby | |
| # 1. export your RIL bookmarks | |
| # 2. save this file to the same directory where your ril_export.html is | |
| # 3. change username and password in the script bellow | |
| # 4. run 'ruby ril_to_instapaper.rb' in terminal | |
| require "cgi" | |
| require "net/http" | |
| require "net/https" |