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rvm install 1.9.2 -C --with-readline-dir=/opt/local,--build=x86_64-apple-darwin10

rvm use --create 1.9.2@rails3

rvm use --create 1.9.2@rails2

rvm use system

rvm use 1.9.2@rails3

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disable oom-killer

Run as root or add to script - for passenger

for pid in $(pidof PassengerNginxHelperServer) ; do echo "disabling oom on pid $pid"; echo -17 | tee /proc/$pid/oom_adj > /dev/null; done

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delete from solr - delete by query

curl http://hostname:port/solr/update --data-binary '<delete><query>id:123456</query></delete>' -H 'Content-type:text/xml; charset=utf-8'

curl http://hostname:port/solr/update --data-binary '<commit waitFlush="false" waitSearcher="false" expungeDeletes="true"/>' -H 'Content-type:text/xml; charset=utf-8'

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bash < <( curl -L http://rvm.beginrescueend.com/releases/rvm-install-head )

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echo "deb http://packages.devstructure.com lucid main" | sudo tee /etc/apt/sources.list.d/devstructure.list
sudo wget -O /etc/apt/trusted.gpg.d/devstructure.gpg http://packages.devstructure.com/keyring.gpg
sudo apt-get update
sudo apt-get -y install blueprint

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sum [n | n <- [3..999], n `mod` 5 == 0 || n `mod` 3 == 0]

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vals = [0, 1]
34.times do
  val = vals[-1] + vals[-2]
  vals.push(val) if val < 4000000
end
vals.select{|item| item % 2 == 0 }.inject(:+)

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octave:2> max(factor(600851475143))

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def palindrome?(str); str.reverse == str; end

max = 0
900.upto(999) { |a|
  a.upto(999) { |b|
    max = [max, a * b].max if palindrome?((a * b).to_s)
  }
}
max

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(400..2432902008176640000).step(20).each do |i|
   val = (1..20).to_a.select{|x| i%x==0}&(1..20).to_a
   if val.count == 20
     puts i
     exit
   end
end

Use the product of the LCM's