blogging and scraping

I am a newbie with ubuntu, I tried and failed several times to install firewatir on ubuntu 10.04, and finally got following codes by google:

sudo su
apt-get install build-essential
apt-get install ruby rdoc libopenssl-ruby
wget http://production.cf.rubygems.org/rubygems/rubygems-1.3.7.tgz
tar zxvf rubygems-1.3.7.tgz
cd rubygems-1.3.7
ruby setup.rb
ln -s /usr/bin/gem1.8 /usr/local/bin/gem
gem install firewatir


Frankly I did not understand the function of the first 2 apt-get, I just copy it for free.