# for-each loop
for i in list
  # do something with item 'i'
  p i
end

# enumeration loop
list.each do |i|
  # do something with item 'i'
  p i
end

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require 'net/http'
require 'yaml'

# install a given gem and version, may also give a URL 
def gem_install(gem, version, url=nil)  
  # only install if not already installed  
  listed = `gem list #{gem} --no-details --local`  
  unless listed =~ %r"^#{gem} "  
    puts "== Installing #{gem}"  
    puts `sudo gem install #{gem} -f -y -v '#{version}'`  
  end  
end  
  
# First try and find a local or given gems.yml file  
gems_config_file = ARGV[0].nil? ? 'gems.yml' : ARGV[0]  
gems = nil  
begin  
  gems = YAML::load_file( gems_config_file )  
rescue Errno::ENOENT => e  
  puts "Could not find file... looking remotely in the wiki Gems.yml"  
  
  url = URI.parse('http://wikiserver/')  
  res = Net::HTTP.start(url.host, url.port) do |http|  
    http.get("/index.php?action=raw&title=Gems.yml")  
  end  
  data = res.body  
  gems = YAML::load(data)  
end  
gems['gems'].each { |gem| gem_install(gem[0], gem[1]) }

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<settings>
  <profiles>
    <profile>
      <id>in-house-repos</id>
      <repositories>

        <!-- Add as many repositories as necessary -->
        <repository>
          <id>in-house-snap-1</id>
          <name>In-House Repository for Snapshots 1</name>
          <!-- look at 'servers' or 'proxies' if you can't connect to the url -->
          <url>http://ourrepo/maven/</url>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>

      </repositories>
    </profile>
  </profiles>

  <!-- must activate the profile -->
  <activeProfiles>
    <activeProfile>in-house-repos</activeProfile>
  </activeProfiles>
</settings>

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function viewMessage( body, connection, view ) {
  var msg = new JVMutableChatMessage('', connection.localUser());
  msg.setBodyAsHTML(body);
  view.sendMessage(msg);
  view.echoSentMessageToDisplay(msg);
  return true;
}

function processUserCommand( command, arguments, connection, view ) {
  if( command == "rtfm" ) {
    switch( arguments[1] ) {
    case "air":
      return viewMessage("http://labs.adobe.com/wiki/index.php/AIR:Documentation", connection, view);
    case "maven":
      return viewMessage("http://maven.apache.org/guides/index.html", connection, view);
    case "google":
      return viewMessage("Google it! http://www.google.com", connection, view);
    default:
      return viewMessage("RTFM!", connection, view);
    }
  }
  return false;
}

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# Notice we have to pass in the 'user_id' on both the find and create method.
def create_avoid_dups
  user_id = current_user.id

  # Find all user's posts
  user_posts = Post.find(:all, :conditions => ["user_id = ?", user_id])

  # Do some logic ...

  # then create new
  @post = Post.create(:body => params[:body], :user_id => user_id)
end

# with_scope lets us extract that parameter:
def create_avoid_dups
  Post.with_scope(:find => {:conditions => "user_id = #{current_user.id}"},
                  :create => {:user_id => current_user.id}) do

    # Find all user's posts
    # No longer need user_id condition since we're in scope
    user_posts = Post.find(:all)

    # Do some logic ...

    # then create new, without specifying user_id
    @post = Post.create(:body => params[:body])
  end
end

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class Code < ActiveRecord::Base
  def to_param
    "#{id}-#{full_name.gsub(/[^a-z1-9]+/i, '-')[0,40]}"
  end
end

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#!/bin/sh
mysqldump --opt --all-databases | bzip2 -c > /var/backup/databasebackup-`date -I`.sql.bz2

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# 'foo' and 'bar' represent regular expressions
sed 's/foo/bar/'                    # replaces only 1st instance in a line
sed 's/foo/bar/4'                   # replaces only 4th instance in a line
sed 's/foo/bar/g'                   # replaces ALL instances in a line
sed 's/\(.*\)foo\(.*foo\)/\1bar\2/' # replace the next-to-last case
sed 's/\(.*\)foo/\1bar/'            # replace only the last case

# Example: Remove first number in a parenthesied list
sed 's/([0-9]*,/(/g' file.txt > new_file.txt

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