RicePaper is a tiny little command-line utility to post URLs to
InstantPaper. It also works as a Ruby library in a pinch also.
Installation
gem install ricepaper
Usage: ricepaper [options] "<url>" ["<url>" "<url>" ...]
-u, --username [USER] Username
-p, --password [PASS] Password
-a, --authenticate Only attempt to authenticate to Instapaper
-t, --title [TITLE] Optional title for instantpaper entry
-d, --description [DESC] Optional description for the article