diff --git a/app/controllers/ical_tickets_controller.rb b/app/controllers/ical_tickets_controller.rb
index bca5f24f5..db300a489 100644
--- a/app/controllers/ical_tickets_controller.rb
+++ b/app/controllers/ical_tickets_controller.rb
@@ -179,7 +179,7 @@ class IcalTicketsController < ApplicationController
         e.dtend       = event_data[:dtend]
         e.summary     = event_data[:summary]
         e.description = event_data[:description]
-        e.ip_class    = "PRIVATE"
+        e.ip_class    = 'PRIVATE'
       end
 
     end
diff --git a/app/controllers/import_otrs_controller.rb b/app/controllers/import_otrs_controller.rb
index cc0bea4d0..96256957d 100644
--- a/app/controllers/import_otrs_controller.rb
+++ b/app/controllers/import_otrs_controller.rb
@@ -45,7 +45,7 @@ class ImportOtrsController < ApplicationController
     suffixes.each {|suffix|
       url = params[:url] + suffix + '?Action=ZammadMigrator'
       # strip multible / in url
-      url.gsub!(/([^:])(\/+\/)/, "\\1/")
+      url.gsub!(/([^:])(\/+\/)/, '\\1/')
       response = UserAgent.request( url )
 
       #Setting.set('import_mode', true)
diff --git a/app/controllers/long_polling_controller.rb b/app/controllers/long_polling_controller.rb
index fa5a99b6b..5381582ad 100644
--- a/app/controllers/long_polling_controller.rb
+++ b/app/controllers/long_polling_controller.rb
@@ -12,7 +12,7 @@ class LongPollingController < ApplicationController
     if !client_id
       new_connection = true
       client_id = client_id_gen
-      log 'notice', "new client connection", client_id
+      log 'notice', 'new client connection', client_id
     end
     if !params['data']
       params['data'] = {}
@@ -31,7 +31,7 @@ class LongPollingController < ApplicationController
       if params['data']['timestamp']
         log 'notice', "request spool data > '#{Time.at( params['data']['timestamp'] ).to_s}'", client_id
       else
-        log 'notice', "request spool init data", client_id
+        log 'notice', 'request spool init data', client_id
       end
 
       if current_user
@@ -41,7 +41,7 @@ class LongPollingController < ApplicationController
             log 'notice', "send spool to (user_id=#{ current_user.id })", client_id
             Sessions.send( client_id, item[:message] )
           else
-            log 'notice', "send spool", client_id
+            log 'notice', 'send spool', client_id
             Sessions.send( client_id, item[:message] )
           end
         }
@@ -49,7 +49,7 @@ class LongPollingController < ApplicationController
 
       # send spool:sent event to client
       sleep 0.2
-      log 'notice', "send spool:sent event", client_id
+      log 'notice', 'send spool:sent event', client_id
       Sessions.send( client_id, { :event => 'spool:sent', :data => { :timestamp => Time.now.utc.to_i } } )
     end
 
@@ -86,7 +86,7 @@ class LongPollingController < ApplicationController
             Sessions.send( local_client_id, params['data'] )
           end
         else
-          log 'notice', "do not send broadcast to it self", client_id
+          log 'notice', 'do not send broadcast to it self', client_id
         end
       }
     end
diff --git a/app/controllers/network_controller.rb b/app/controllers/network_controller.rb
index 5c39e9d2e..eb2e05efc 100644
--- a/app/controllers/network_controller.rb
+++ b/app/controllers/network_controller.rb
@@ -51,7 +51,7 @@ class NetworksController < ApplicationController
         format.html { redirect_to @network, :notice => 'Network was successfully created.' }
         format.json { render :json => @network, :status => :created }
       else
-        format.html { render :action => "new" }
+        format.html { render :action => 'new' }
         format.json { render :json => @network.errors, :status => :unprocessable_entity }
       end
     end
@@ -67,7 +67,7 @@ class NetworksController < ApplicationController
         format.html { redirect_to @network, :notice => 'Network was successfully updated.' }
         format.json { render :json => @network, :status => :ok }
       else
-        format.html { render :action => "edit" }
+        format.html { render :action => 'edit' }
         format.json { render :json => @network.errors, :status => :unprocessable_entity }
       end
     end
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 6f9812d24..9e15657ad 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -138,7 +138,7 @@ class SessionsController < ApplicationController
     auth = request.env['omniauth.auth']
 
     if !auth
-      logger.info("AUTH IS NULL, SERVICE NOT LINKED TO ACCOUNT")
+      logger.info('AUTH IS NULL, SERVICE NOT LINKED TO ACCOUNT')
 
       # redirect to app
       redirect_to '/'
diff --git a/app/controllers/tickets_controller.rb b/app/controllers/tickets_controller.rb
index 8cddb61a2..e9e5b0de8 100644
--- a/app/controllers/tickets_controller.rb
+++ b/app/controllers/tickets_controller.rb
@@ -352,7 +352,7 @@ class TicketsController < ApplicationController
   def stats
 
     if !params[:user_id] && !params[:organization_id]
-      raise "Need user_id or organization_id as param"
+      raise 'Need user_id or organization_id as param'
     end
 
     # permissin check
diff --git a/app/models/application_model.rb b/app/models/application_model.rb
index 045a9ae91..0695b89b4 100644
--- a/app/models/application_model.rb
+++ b/app/models/application_model.rb
@@ -344,7 +344,7 @@ returns
       }
       return
     else
-      raise "Need name, id or login for lookup()"
+      raise 'Need name, id or login for lookup()'
     end
   end
 
@@ -439,7 +439,7 @@ returns
       record.save
       return record
     else
-      raise "Need name, login or locale for create_or_update()"
+      raise 'Need name, login or locale for create_or_update()'
     end
   end
 
diff --git a/app/models/channel/email_parser.rb b/app/models/channel/email_parser.rb
index 2e9420ca0..6ee4d30b2 100644
--- a/app/models/channel/email_parser.rb
+++ b/app/models/channel/email_parser.rb
@@ -142,7 +142,7 @@ class Channel::EmailParser
           data[:body] = Encode.conv( mail.html_part.charset.to_s, data[:body] )
           data[:body] = data[:body].html2text.to_s.force_encoding('utf-8')
 
-          if !data[:body].force_encoding("UTF-8").valid_encoding?
+          if !data[:body].force_encoding('UTF-8').valid_encoding?
             data[:body] = data[:body].encode('utf-8', 'binary', :invalid => :replace, :undef => :replace, :replace => '?')
           end
 
@@ -195,7 +195,7 @@ class Channel::EmailParser
         data[:body] = mail.body.decoded
         data[:body] = Encode.conv( mail.charset, data[:body] )
 
-        if !data[:body].force_encoding("UTF-8").valid_encoding?
+        if !data[:body].force_encoding('UTF-8').valid_encoding?
           data[:body] = data[:body].encode('utf-8', 'binary', :invalid => :replace, :undef => :replace, :replace => '?')
         end
 
@@ -576,7 +576,7 @@ module Mail
   module Encodings
     def Encodings.value_decode(str)
       # Optimization: If there's no encoded-words in the string, just return it
-      return str unless str.index("=?")
+      return str unless str.index('=?')
 
       str = str.gsub(/\?=(\s*)=\?/, '?==?') # Remove whitespaces between 'encoded-word's
 
@@ -604,7 +604,7 @@ module Mail
             end
           end
         end
-      end.join("")
+      end.join('')
     end
   end
 end
\ No newline at end of file
diff --git a/app/models/channel/imap.rb b/app/models/channel/imap.rb
index 856f2b8f7..f1f22b0e9 100644
--- a/app/models/channel/imap.rb
+++ b/app/models/channel/imap.rb
@@ -42,7 +42,7 @@ class Channel::IMAP < Channel::EmailParser
       @imap.select( channel[:options][:folder] )
     end
     if check_type == 'check'
-      puts "check only mode, fetch no emails"
+      puts 'check only mode, fetch no emails'
       disconnect
       return
     elsif check_type == 'verify'
@@ -68,7 +68,7 @@ class Channel::IMAP < Channel::EmailParser
         subject = @imap.fetch(message_id,'ENVELOPE')[0].attr['ENVELOPE'].subject
         if subject && subject =~ /#{verify_string}/
           puts " - verify email #{verify_string} found"
-          @imap.store(message_id, "+FLAGS", [:Deleted])
+          @imap.store(message_id, '+FLAGS', [:Deleted])
           @imap.expunge()
           disconnect
           return 'verify ok'
@@ -78,16 +78,16 @@ class Channel::IMAP < Channel::EmailParser
         # delete email from server after article was created
         msg = @imap.fetch(message_id,'RFC822')[0].attr['RFC822']
         if process(channel, msg)
-          @imap.store(message_id, "+FLAGS", [:Deleted])
+          @imap.store(message_id, '+FLAGS', [:Deleted])
         end
       end
     end
     @imap.expunge()
     disconnect
     if count == 0
-      puts " - no message"
+      puts ' - no message'
     end
-    puts "done"
+    puts 'done'
   end
 
   def disconnect
diff --git a/app/models/channel/mail_stdin.rb b/app/models/channel/mail_stdin.rb
index eaf9368fa..225dd1607 100644
--- a/app/models/channel/mail_stdin.rb
+++ b/app/models/channel/mail_stdin.rb
@@ -2,7 +2,7 @@
 
 class Channel::MailStdin < Channel::EmailParser
   def initialize
-    puts "read main from STDIN"
+    puts 'read main from STDIN'
 
     msg = ARGF.read
 
diff --git a/app/models/channel/pop3.rb b/app/models/channel/pop3.rb
index 6a36704d9..b4cd6323d 100644
--- a/app/models/channel/pop3.rb
+++ b/app/models/channel/pop3.rb
@@ -27,11 +27,11 @@ class Channel::POP3 < Channel::EmailParser
     end
     @pop.start( channel[:options][:user], channel[:options][:password] )
     if check_type == 'check'
-      puts "check only mode, fetch no emails"
+      puts 'check only mode, fetch no emails'
       disconnect
       return
     elsif check_type == 'verify'
-      puts "verify mode, fetch no emails"
+      puts 'verify mode, fetch no emails'
     end
 
     mails     = @pop.mails
@@ -66,9 +66,9 @@ class Channel::POP3 < Channel::EmailParser
     end
     disconnect
     if count == 0
-      puts " - no message"
+      puts ' - no message'
     end
-    puts "done"
+    puts 'done'
   end
 
   def disconnect
diff --git a/app/models/channel/twitter2.rb b/app/models/channel/twitter2.rb
index df418a7b4..a0db2ec5e 100644
--- a/app/models/channel/twitter2.rb
+++ b/app/models/channel/twitter2.rb
@@ -28,7 +28,7 @@ class Channel::TWITTER2
       channel[:options][:search].each { |search|
         puts " - searching for #{search[:item]}"
         tweets = []
-        @client.search( search[:item], :count => 50, :result_type => "recent" ).collect do |tweet|
+        @client.search( search[:item], :count => 50, :result_type => 'recent' ).collect do |tweet|
           tweets.push tweet
         end
         @article_type = 'twitter status'
@@ -38,7 +38,7 @@ class Channel::TWITTER2
 
     # mentions
     if channel[:options][:mentions]
-      puts " - searching for mentions"
+      puts ' - searching for mentions'
       tweets = @client.mentions_timeline
       @article_type = 'twitter status'
       fetch_loop( tweets, channel, channel[:options][:mentions][:group] )
@@ -46,7 +46,7 @@ class Channel::TWITTER2
 
     # direct messages
     if channel[:options][:direct_messages]
-      puts " - searching for direct_messages"
+      puts ' - searching for direct_messages'
       tweets = @client.direct_messages
       @article_type = 'twitter direct-message'
       fetch_loop( tweets, channel, channel[:options][:direct_messages][:group] )
@@ -112,7 +112,7 @@ class Channel::TWITTER2
       begin
         sender = @client.user(tweet.from_user_id)
       rescue Exception => e
-        puts "Exception: twitter: " + e.inspect
+        puts 'Exception: twitter: ' + e.inspect
         return
       end
     end
diff --git a/app/models/job.rb b/app/models/job.rb
index 30d473337..e8e74082d 100644
--- a/app/models/job.rb
+++ b/app/models/job.rb
@@ -80,7 +80,7 @@ class Job < ApplicationModel
   end
 
   def self.match_minutes(minutes)
-    minutes.gsub!(/(\d)\d/, "\\1")
+    minutes.gsub!(/(\d)\d/, '\\1')
     minutes.to_s + '0'
   end
 end
\ No newline at end of file
diff --git a/app/models/package.rb b/app/models/package.rb
index 55fd551af..a170ad1ed 100644
--- a/app/models/package.rb
+++ b/app/models/package.rb
@@ -19,9 +19,9 @@ class Package < ApplicationModel
       package = self._parse( data[:string] )
     end
 
-    build_date = REXML::Element.new("build_date")
+    build_date = REXML::Element.new('build_date')
     build_date.text = Time.now.utc.iso8601
-    build_host = REXML::Element.new("build_host")
+    build_host = REXML::Element.new('build_host')
     build_host.text = Socket.gethostname
 
     package.root.insert_after( '//zpm/description', build_date )
@@ -33,7 +33,7 @@ class Package < ApplicationModel
       element.text = base64
     end
     if data[:output]
-      location = data[:output] + '/' + package.elements["zpm/name"].text + '-' + package.elements["zpm/version"].text + '.zpm'
+      location = data[:output] + '/' + package.elements['zpm/name'].text + '-' + package.elements['zpm/version'].text + '.zpm'
       logger.info "NOTICE: writting package to '#{location}'"
       file = File.new( location, 'wb' )
       file.write( package.to_s )
@@ -186,9 +186,9 @@ class Package < ApplicationModel
 
     # package meta data
     meta = {
-      :name           => package.elements["zpm/name"].text,
-      :version        => package.elements["zpm/version"].text,
-      :vendor         => package.elements["zpm/vendor"].text,
+      :name           => package.elements['zpm/name'].text,
+      :version        => package.elements['zpm/version'].text,
+      :vendor         => package.elements['zpm/vendor'].text,
       :state          => 'uninstalled',
       :created_by_id  => 1,
       :updated_by_id  => 1,
@@ -275,8 +275,8 @@ class Package < ApplicationModel
 
     # package meta data
     meta = {
-      :name           => package.elements["zpm/name"].text,
-      :version        => package.elements["zpm/version"].text,
+      :name           => package.elements['zpm/name'].text,
+      :version        => package.elements['zpm/version'].text,
     }
 
     # down migrations
diff --git a/app/models/scheduler.rb b/app/models/scheduler.rb
index b7c05350c..341d06947 100644
--- a/app/models/scheduler.rb
+++ b/app/models/scheduler.rb
@@ -114,7 +114,7 @@ class Scheduler < ApplicationModel
 
       if count.zero?
         sleep(wait)
-        logger.info "*** worker loop"
+        logger.info '*** worker loop'
       else
         printf "*** #{count} jobs processed at %.4f j/s, %d failed ...\n" % [count / realtime, result.last]
       end
diff --git a/app/models/store/file.rb b/app/models/store/file.rb
index 978abf108..4e86d51d9 100644
--- a/app/models/store/file.rb
+++ b/app/models/store/file.rb
@@ -14,7 +14,7 @@ class Store::File < ApplicationModel
       # load backend based on config
       adapter_name = Setting.get('storage_provider') || 'DB'
       if !adapter_name
-        raise "Missing storage_provider setting option"
+        raise 'Missing storage_provider setting option'
       end
       adapter = self.load_adapter( "Store::Provider::#{ adapter_name }" )
       adapter.add( data, sha )
diff --git a/app/models/ticket/number.rb b/app/models/ticket/number.rb
index 864a4c67a..368e210d2 100644
--- a/app/models/ticket/number.rb
+++ b/app/models/ticket/number.rb
@@ -47,7 +47,7 @@ returns
     # load backend based on config
     adapter_name = Setting.get('ticket_number')
     if !adapter_name
-      raise "Missing ticket_number setting option"
+      raise 'Missing ticket_number setting option'
     end
     adapter = load_adapter(adapter_name)
     if !adapter
diff --git a/app/models/ticket/number/date.rb b/app/models/ticket/number/date.rb
index 1105d7c1f..1c880bd40 100644
--- a/app/models/ticket/number/date.rb
+++ b/app/models/ticket/number/date.rb
@@ -9,7 +9,7 @@ module Ticket::Number::Date
     config = Setting.get('ticket_number_date')
 
     t = Time.now
-    date = t.strftime("%Y-%m-%d")
+    date = t.strftime('%Y-%m-%d')
 
     # read counter
     counter_increment = nil
@@ -33,7 +33,7 @@ module Ticket::Number::Date
     end
 
     system_id = Setting.get('system_id') || ''
-    number = t.strftime("%Y%m%d") + system_id.to_s + sprintf( "%04d", counter_increment)
+    number = t.strftime('%Y%m%d') + system_id.to_s + sprintf( '%04d', counter_increment)
 
     # calculate a checksum
     # The algorithm to calculate the checksum is derived from the one
diff --git a/app/models/ticket/search_index.rb b/app/models/ticket/search_index.rb
index d78ca0eed..519d5921d 100644
--- a/app/models/ticket/search_index.rb
+++ b/app/models/ticket/search_index.rb
@@ -88,7 +88,7 @@ returns
           # check ignored files
           if attachment.filename
             filename_extention = attachment.filename.downcase
-            filename_extention.gsub!(/^.*(\..+?)$/, "\\1")
+            filename_extention.gsub!(/^.*(\..+?)$/, '\\1')
             if !attachments_ignore.include?( filename_extention.downcase )
               data = {
                 '_name'    => attachment.filename,
diff --git a/config/application.rb b/config/application.rb
index 6538be81d..de8919d17 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -54,7 +54,7 @@ module Zammad
     # config.i18n.default_locale = :de
 
     # Configure the default encoding used in templates for Ruby 1.9.
-    config.encoding = "utf-8"
+    config.encoding = 'utf-8'
 
     # Configure sensitive parameters which will be filtered from the log file.
     config.filter_parameters += [:password]
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 64e96eec1..6dd496a98 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -14,7 +14,7 @@ Zammad::Application.configure do
 
   # Configure static asset server for tests with Cache-Control for performance
   config.serve_static_assets  = true
-  config.static_cache_control = "public, max-age=3600"
+  config.static_cache_control = 'public, max-age=3600'
 
   # Disable assert compression for relyable error code lines
   config.assets.compress = false
diff --git a/config/environments/test_mysql.rb b/config/environments/test_mysql.rb
index b3ae7c547..c4b12b375 100644
--- a/config/environments/test_mysql.rb
+++ b/config/environments/test_mysql.rb
@@ -9,7 +9,7 @@ Zammad::Application.configure do
 
   # Configure static asset server for tests with Cache-Control for performance
   config.serve_static_assets  = true
-  config.static_cache_control = "public, max-age=3600"
+  config.static_cache_control = 'public, max-age=3600'
 
   # Disable assert compression for relyable error code lines
   config.assets.compress = false
diff --git a/lib/core_ext/class.rb b/lib/core_ext/class.rb
index ebd89f90c..865d7eae5 100644
--- a/lib/core_ext/class.rb
+++ b/lib/core_ext/class.rb
@@ -4,7 +4,7 @@ class Class
     camel_cased_word.gsub(/::/, '_').
       gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
       gsub(/([a-z\d])([A-Z])/,'\1_\2').
-      tr("-", "_").
+      tr('-', '_').
       downcase
   end
   def to_app_model
diff --git a/lib/core_ext/string.rb b/lib/core_ext/string.rb
index 72d6241c4..4190f8463 100644
--- a/lib/core_ext/string.rb
+++ b/lib/core_ext/string.rb
@@ -84,10 +84,10 @@ class String
 
     # pre/code handling 1/2
     string.gsub!( /<pre>(.+?)<\/pre>/m ) { |placeholder|
-      placeholder = placeholder.gsub(/\n/, "###BR###")
+      placeholder = placeholder.gsub(/\n/, '###BR###')
     }
     string.gsub!( /<code>(.+?)<\/code>/m ) { |placeholder|
-      placeholder = placeholder.gsub(/\n/, "###BR###")
+      placeholder = placeholder.gsub(/\n/, '###BR###')
     }
 
     # remove all new lines
diff --git a/lib/fill_db.rb b/lib/fill_db.rb
index 234f34ada..5d4bd1142 100644
--- a/lib/fill_db.rb
+++ b/lib/fill_db.rb
@@ -1,6 +1,6 @@
 module FillDB
   def self.load( agents, customers, groups, organizations, tickets )
-    puts "load db with:"
+    puts 'load db with:'
     puts " agents:#{agents}"
     puts " customers:#{customers}"
     puts " groups:#{groups}"
diff --git a/lib/geo_ip/zammad_geo_ip.rb b/lib/geo_ip/zammad_geo_ip.rb
index c167b6635..8b65d7ecd 100644
--- a/lib/geo_ip/zammad_geo_ip.rb
+++ b/lib/geo_ip/zammad_geo_ip.rb
@@ -11,7 +11,7 @@ class GeoIp::ZammadGeoIp
     return cache if cache
 
     # do lookup
-    host = "https://geo.zammad.com"
+    host = 'https://geo.zammad.com'
     url  = "/lookup?ip=#{CGI::escape address}"
     data = {}
     begin
diff --git a/lib/import/otrs.rb b/lib/import/otrs.rb
index 4ea2d3a69..661ac04a1 100644
--- a/lib/import/otrs.rb
+++ b/lib/import/otrs.rb
@@ -43,7 +43,7 @@ module Import::OTRS
   end
 
   def self.auth(username, password)
-    response = post( "public.pl", { :Action => 'Export', :Type => 'Auth', :User => username, :Pw => password } )
+    response = post( 'public.pl', { :Action => 'Export', :Type => 'Auth', :User => username, :Pw => password } )
     return if !response
     return if !response.success?
 
@@ -52,7 +52,7 @@ module Import::OTRS
   end
 
   def self.session(session_id)
-    response = post( "public.pl", { :Action => 'Export', :Type => 'SessionCheck', :SessionID => session_id } )
+    response = post( 'public.pl', { :Action => 'Export', :Type => 'SessionCheck', :SessionID => session_id } )
     return if !response
     return if !response.success?
 
@@ -117,10 +117,10 @@ module Import::OTRS
 
     # check if system is in import mode
     if !Setting.get('import_mode')
-        raise "System is not in import mode!"
+        raise 'System is not in import mode!'
     end
 
-    response = request("public.pl?Action=Export")
+    response = request('public.pl?Action=Export')
     return if !response
     return if !response.success?
 
@@ -181,7 +181,7 @@ module Import::OTRS
 
     # check if system is in import mode
     if !Setting.get('import_mode')
-        raise "System is not in import mode!"
+        raise 'System is not in import mode!'
     end
 
     # create states
@@ -203,7 +203,7 @@ module Import::OTRS
 
 
   def self.ticket_diff()
-    url = "public.pl?Action=Export;Type=TicketDiff;Limit=30"
+    url = 'public.pl?Action=Export;Type=TicketDiff;Limit=30'
     response = request( url )
     return if !response
     return if !response.success?
@@ -212,7 +212,7 @@ module Import::OTRS
   end
 
   def self.ticket(ticket_ids)
-    url = "public.pl?Action=Export;Type=Ticket;"
+    url = 'public.pl?Action=Export;Type=Ticket;'
     ticket_ids.each {|ticket_id|
       url = url + "TicketID=#{CGI::escape ticket_id};"
     }
@@ -543,7 +543,7 @@ module Import::OTRS
   end
 
   def self.state
-    response = request( "public.pl?Action=Export;Type=State" )
+    response = request( 'public.pl?Action=Export;Type=State' )
     return if !response
     return if !response.success?
 
@@ -600,7 +600,7 @@ module Import::OTRS
     }
   end
   def self.priority
-    response = request( "public.pl?Action=Export;Type=Priority" )
+    response = request( 'public.pl?Action=Export;Type=Priority' )
     return if !response
     return if !response.success?
 
@@ -644,7 +644,7 @@ module Import::OTRS
     }
   end
   def self.ticket_group
-    response = request( "public.pl?Action=Export;Type=Queue" )
+    response = request( 'public.pl?Action=Export;Type=Queue' )
     return if !response
     return if !response.success?
 
@@ -688,7 +688,7 @@ module Import::OTRS
     }
   end
   def self.user
-    response = request( "public.pl?Action=Export;Type=User" )
+    response = request( 'public.pl?Action=Export;Type=User' )
     return if !response
     return if !response.success?
     result = json(response)
diff --git a/lib/import/otrs2.rb b/lib/import/otrs2.rb
index 63b7a927a..248ce93a5 100644
--- a/lib/import/otrs2.rb
+++ b/lib/import/otrs2.rb
@@ -29,7 +29,7 @@ module Import::OTRS2
     end
     result = json(response)
     if !result
-      raise "Invalid response"
+      raise 'Invalid response'
     end
     if data_only
       result['Result']
@@ -292,12 +292,12 @@ module Import::OTRS2
 
     # check if system is in import mode
     if !Setting.get('import_mode')
-      raise "System is not in import mode!"
+      raise 'System is not in import mode!'
     end
 
     result = request_json({})
     if !result['Success']
-      "API key not valid!"
+      'API key not valid!'
     end
 
     # set settings
@@ -350,7 +350,7 @@ module Import::OTRS2
         count += steps
         records = load('CustomerUser', steps, count-steps)
         if !records || !records[0]
-          log "all customers imported."
+          log 'all customers imported.'
           run = false
           next
         end
@@ -408,7 +408,7 @@ module Import::OTRS2
 
     # check if system is in import mode
     if !Setting.get('import_mode')
-      raise "System is not in import mode!"
+      raise 'System is not in import mode!'
     end
 
     # create states
@@ -450,14 +450,14 @@ module Import::OTRS2
     locks = { :User => {} }
     while run
       count += steps
-      log "loading... diff ..."
+      log 'loading... diff ...'
       offset = count-steps
       if offset != 0
         offset = count - steps + 1
       end
       records = load( 'Ticket', steps, count-steps, 1 )
       if !records || !records[0]
-        log "... no more work."
+        log '... no more work.'
         run = false
         next
       end
diff --git a/lib/search_index_backend.rb b/lib/search_index_backend.rb
index bc6834caf..f9cb6daba 100644
--- a/lib/search_index_backend.rb
+++ b/lib/search_index_backend.rb
@@ -174,7 +174,7 @@ return search result
           :order => 'desc'
         }
       },
-      "_score"
+      '_score'
     ]
 
     data['query'] = query_extention || {}
diff --git a/lib/sessions/client.rb b/lib/sessions/client.rb
index 24bb832f1..f175e3426 100644
--- a/lib/sessions/client.rb
+++ b/lib/sessions/client.rb
@@ -2,9 +2,9 @@ class Sessions::Client
 
   def initialize( client_id )
     @client_id = client_id
-    self.log 'notify', "---client start ws connection---"
+    self.log 'notify', '---client start ws connection---'
     self.fetch
-    self.log 'notify', "---client exiting ws connection---"
+    self.log 'notify', '---client exiting ws connection---'
   end
 
   def fetch
@@ -56,7 +56,7 @@ class Sessions::Client
         pool.push
       }
 
-      self.log 'notice', "---/client-"
+      self.log 'notice', '---/client-'
 
       # start faster in the beginnig
       if loop_count < 20
diff --git a/lib/static_assets.rb b/lib/static_assets.rb
index 569287603..b580a960b 100644
--- a/lib/static_assets.rb
+++ b/lib/static_assets.rb
@@ -31,7 +31,7 @@ module StaticAssets
     if list && list[0]
       return Store.find( list[0] )
     end
-    raise "No such raw logo!"
+    raise 'No such raw logo!'
   end
 
   # store image in right size
diff --git a/lib/tasks/search_index_es.rake b/lib/tasks/search_index_es.rake
index 0a4475163..49cfcc620 100644
--- a/lib/tasks/search_index_es.rake
+++ b/lib/tasks/search_index_es.rake
@@ -5,7 +5,7 @@ namespace :searchindex do
   task :drop, [:opts] => :environment do |t, args|
 
     # drop indexes
-    puts "drop indexes..."
+    puts 'drop indexes...'
     SearchIndexBackend.index(
       :action => 'delete',
     )
@@ -15,7 +15,7 @@ namespace :searchindex do
   task :create, [:opts] => :environment do |t, args|
 
     # create indexes
-    puts "create indexes..."
+    puts 'create indexes...'
     SearchIndexBackend.index(
       :action => 'create',
       :data   => {
@@ -41,7 +41,7 @@ namespace :searchindex do
 
   task :reload, [:opts] => :environment do |t, args|
 
-    puts "reload data..."
+    puts 'reload data...'
     User.search_index_reload
     Organization.search_index_reload
     Ticket.search_index_reload
@@ -50,9 +50,9 @@ namespace :searchindex do
 
   task :rebuild, [:opts] => :environment do |t, args|
 
-    Rake::Task["searchindex:drop"].execute
-    Rake::Task["searchindex:create"].execute
-    Rake::Task["searchindex:reload"].execute
+    Rake::Task['searchindex:drop'].execute
+    Rake::Task['searchindex:create'].execute
+    Rake::Task['searchindex:reload'].execute
 
   end
 end
diff --git a/lib/tasks/test_browser.rake b/lib/tasks/test_browser.rake
index a169b1b72..e0bc526de 100644
--- a/lib/tasks/test_browser.rake
+++ b/lib/tasks/test_browser.rake
@@ -2,7 +2,7 @@ $LOAD_PATH << './lib'
 require 'rubygems'
 
 namespace :test do
-  desc "Start browser tests"
+  desc 'Start browser tests'
   task :browser, [:opts] => :environment do |t, args|
 
     start = Time.now()
@@ -11,10 +11,10 @@ namespace :test do
     end
     Dir.glob('test/browser/*_test.rb').sort.each { |r|
       sh "#{args.opts} ruby -Itest #{r}" do |ok, res|
-        raise "Failed test. " + res.inspect if !ok
+        raise 'Failed test. ' + res.inspect if !ok
       end
     }
-    puts "All browser tests, elapsed: " + (Time.now() - start).to_s + " seconds"
+    puts 'All browser tests, elapsed: ' + (Time.now() - start).to_s + ' seconds'
 
   end
 end
diff --git a/lib/time_calculation.rb b/lib/time_calculation.rb
index 290f0aad4..b0ad79507 100644
--- a/lib/time_calculation.rb
+++ b/lib/time_calculation.rb
@@ -49,7 +49,7 @@ put working hours matrix and timezone in function, returns UTC working hours mat
     }
 
     if !config_ok
-      raise "sla config is invalid! " + config.inspect
+      raise 'sla config is invalid! ' + config.inspect
     end
 
     # shift working hours / if needed
diff --git a/lib/user_agent.rb b/lib/user_agent.rb
index a079a9129..995322839 100644
--- a/lib/user_agent.rb
+++ b/lib/user_agent.rb
@@ -267,7 +267,7 @@ returns
 
     def self.set_params(request, params, options)
       if options[:json]
-        request.add_field("Content-Type", "application/json")
+        request.add_field('Content-Type', 'application/json')
         if !params.empty?
           request.body = params.to_json
         end
@@ -308,7 +308,7 @@ returns
           :code    => response.code,
         )
       when Net::HTTPRedirection
-        raise "Too many redirections for the original URL, halting." if count <= 0
+        raise 'Too many redirections for the original URL, halting.' if count <= 0
         url = response['location']
         return get(url, params, options, count - 1)
       when Net::HTTPOK
diff --git a/script/code_beauty_ruby.rb b/script/code_beauty_ruby.rb
index 32dbc9101..6a8b588b2 100755
--- a/script/code_beauty_ruby.rb
+++ b/script/code_beauty_ruby.rb
@@ -20,13 +20,13 @@
  ***************************************************************************/
 =end
 
-PVERSION = "Version 2.9, 10/24/2008"
+PVERSION = 'Version 2.9, 10/24/2008'
 
 module RBeautify
 
    # user-customizable values
 
-   RBeautify::TabStr = " "
+   RBeautify::TabStr = ' '
    RBeautify::TabSize = 2
 
    # indent regexp tests
@@ -71,7 +71,7 @@ module RBeautify
    ]
 
    def RBeautify.rb_make_tab(tab)
-      return (tab < 0)?"":TabStr * TabSize * tab
+      return (tab < 0)?'':TabStr * TabSize * tab
    end
 
    def RBeautify.rb_add_line(line,tab)
@@ -80,13 +80,13 @@ module RBeautify
       return line
    end
 
-   def RBeautify.beautify_string(source, path = "")
+   def RBeautify.beautify_string(source, path = '')
       comment_block = false
       in_here_doc = false
-      here_doc_term = ""
+      here_doc_term = ''
       program_end = false
       multiLine_array = []
-      multiLine_str = ""
+      multiLine_str = ''
       tab = 0
       output = []
       source.each do |line|
@@ -99,14 +99,14 @@ module RBeautify
                # combine continuing lines
                if(!(line =~ /^\s*#/) && line =~ /[^\\]\\\s*$/)
                   multiLine_array.push line
-                  multiLine_str += line.sub(/^(.*)\\\s*$/,"\\1")
+                  multiLine_str += line.sub(/^(.*)\\\s*$/,'\\1')
                   next
                end
 
                # add final line
                if(multiLine_str.length > 0)
                   multiLine_array.push line
-                  multiLine_str += line.sub(/^(.*)\\\s*$/,"\\1")
+                  multiLine_str += line.sub(/^(.*)\\\s*$/,'\\1')
                end
 
                tline = ((multiLine_str.length > 0)?multiLine_str:line).strip
@@ -117,7 +117,7 @@ module RBeautify
                   in_here_doc = false if tline =~ %r{\s*#{here_doc_term}\s*}
                else # not in here_doc
                   if tline =~ %r{=\s*<<}
-                     here_doc_term = tline.sub(%r{.*=\s*<<-?\s*([_|\w]+).*},"\\1")
+                     here_doc_term = tline.sub(%r{.*=\s*<<-?\s*([_|\w]+).*},'\\1')
                      in_here_doc = here_doc_term.size > 0
                   end
                end
@@ -131,24 +131,24 @@ module RBeautify
             if(!comment_line)
                # throw out sequences that will
                # only sow confusion
-               while tline.gsub!(/\{[^\{]*?\}/,"")
+               while tline.gsub!(/\{[^\{]*?\}/,'')
                end
-               while tline.gsub!(/\[[^\[]*?\]/,"")
+               while tline.gsub!(/\[[^\[]*?\]/,'')
                end
-               while tline.gsub!(/'.*?'/,"")
+               while tline.gsub!(/'.*?'/,'')
                end
-               while tline.gsub!(/".*?"/,"")
+               while tline.gsub!(/".*?"/,'')
                end
-               while tline.gsub!(/\`.*?\`/,"")
+               while tline.gsub!(/\`.*?\`/,'')
                end
-               while tline.gsub!(/\([^\(]*?\)/,"")
+               while tline.gsub!(/\([^\(]*?\)/,'')
                end
-               while tline.gsub!(/\/.*?\//,"")
+               while tline.gsub!(/\/.*?\//,'')
                end
-               while tline.gsub!(/%r(.).*?\1/,"")
+               while tline.gsub!(/%r(.).*?\1/,'')
                end
                # delete end-of-line comments
-               tline.sub!(/#[^\"]+$/,"")
+               tline.sub!(/#[^\"]+$/,'')
                # convert quotes
                tline.gsub!(/\\\"/,"'")
                OutdentExp.each do |re|
@@ -163,7 +163,7 @@ module RBeautify
                   output << rb_add_line(ml,tab)
                end
                multiLine_array.clear
-               multiLine_str = ""
+               multiLine_str = ''
             else
                output << rb_add_line(line,tab)
             end
@@ -189,7 +189,7 @@ module RBeautify
       error = false
       if(path == '-') # stdin source
          source = STDIN.read
-         dest,error = beautify_string(source,"stdin")
+         dest,error = beautify_string(source,'stdin')
          print dest
       else # named file source
          source = File.read(path)
@@ -198,7 +198,7 @@ module RBeautify
             # make a backup copy
             #File.open(path + "~","w") { |f| f.write(source) }
             # overwrite the original
-            File.open(path,"w") { |f| f.write(dest) }
+            File.open(path,'w') { |f| f.write(dest) }
          end
       end
       return error
diff --git a/script/scheduler.rb b/script/scheduler.rb
index d35a44ccc..3fa75a33d 100755
--- a/script/scheduler.rb
+++ b/script/scheduler.rb
@@ -28,9 +28,9 @@ runner_count = 2
     Dir.chdir dir
     RAILS_ENV = ARGV.first || ENV['RAILS_ENV'] || 'development'
 
-    $stdout.reopen( dir + "/log/" + name + "_out.log", "w")
-    $stderr.reopen( dir + "/log/" + name + "_err.log", "w")
-    require File.join(dir, "config", "environment")
+    $stdout.reopen( dir + '/log/' + name + '_out.log', 'w')
+    $stderr.reopen( dir + '/log/' + name + '_err.log', 'w')
+    require File.join(dir, 'config', 'environment')
     require 'scheduler'
 
     Scheduler.run(count, runner_count)
@@ -48,9 +48,9 @@ Daemons.run_proc(name, daemon_options) do
   Dir.chdir dir
   RAILS_ENV = ARGV.first || ENV['RAILS_ENV'] || 'development'
 
-  $stdout.reopen( dir + "/log/" + name + "_out.log", "w")
-  $stderr.reopen( dir + "/log/" + name + "_err.log", "w")
-  require File.join(dir, "config", "environment")
+  $stdout.reopen( dir + '/log/' + name + '_out.log', 'w')
+  $stderr.reopen( dir + '/log/' + name + '_err.log', 'w')
+  require File.join(dir, 'config', 'environment')
   require 'scheduler'
 
   Scheduler.worker
diff --git a/script/source_code_filter.rb b/script/source_code_filter.rb
index 8a1fd562d..5967888ca 100755
--- a/script/source_code_filter.rb
+++ b/script/source_code_filter.rb
@@ -70,7 +70,7 @@ end
 folder = ['app/assets/javascripts/app','app/controllers/', 'app/models/', 'app/helpers/', 'app/mailers/' ]
 folder.each do |folder|
   puts 'Working on folder' + folder.to_s
-  rbfiles = File.join("../#{folder}**", "*.{rb,coffee}")
+  rbfiles = File.join("../#{folder}**", '*.{rb,coffee}')
   d = Dir.glob(rbfiles)
 
   d.each  {|fileName|
diff --git a/script/websocket-server.rb b/script/websocket-server.rb
index a81a07266..8d011c354 100755
--- a/script/websocket-server.rb
+++ b/script/websocket-server.rb
@@ -26,30 +26,30 @@ require 'daemons'
 
 tls_options = {}
 OptionParser.new do |opts|
-  opts.banner = "Usage: websocket-server.rb start|stop [options]"
+  opts.banner = 'Usage: websocket-server.rb start|stop [options]'
 
-  opts.on("-d", "--daemon", "start as daemon") do |d|
+  opts.on('-d', '--daemon', 'start as daemon') do |d|
     @options[:d] = d
   end
-  opts.on("-v", "--verbose", "enable debug messages") do |d|
+  opts.on('-v', '--verbose', 'enable debug messages') do |d|
     @options[:v] = d
   end
-  opts.on("-p", "--port [OPT]", "port of websocket server") do |p|
+  opts.on('-p', '--port [OPT]', 'port of websocket server') do |p|
     @options[:p] = p
   end
-  opts.on("-b", "--bind [OPT]", "bind address") do |b|
+  opts.on('-b', '--bind [OPT]', 'bind address') do |b|
     @options[:b] = b
   end
-  opts.on("-s", "--secure", "enable secure connections") do |s|
+  opts.on('-s', '--secure', 'enable secure connections') do |s|
     @options[:s] = s
   end
-  opts.on("-i", "--pid [OPT]", "pid, default is tmp/pids/websocket.pid") do |i|
+  opts.on('-i', '--pid [OPT]', 'pid, default is tmp/pids/websocket.pid') do |i|
     @options[:i] = i
   end
-  opts.on("-k", "--private-key [OPT]", "/path/to/server.key for secure connections") do |k|
+  opts.on('-k', '--private-key [OPT]', '/path/to/server.key for secure connections') do |k|
     tls_options[:private_key_file] = k
   end
-  opts.on("-c", "--certificate [OPT]", "/path/to/server.crt for secure connections") do |c|
+  opts.on('-c', '--certificate [OPT]', '/path/to/server.crt for secure connections') do |c|
     tls_options[:cert_chain_file] = c
   end
 end.parse!
@@ -66,7 +66,7 @@ if ARGV[0] == 'stop'
 
   # read pid
   pid =File.open( @options[:i].to_s  ).read
-  pid.gsub!(/\r|\n/, "")
+  pid.gsub!(/\r|\n/, '')
 
   # kill
   Process.kill( 9, pid.to_i )
@@ -77,7 +77,7 @@ if ARGV[0] == 'start'  && @options[:d]
   Daemons.daemonize
 
   # create pid file
-  $daemon_pid = File.new( @options[:i].to_s,"w" )
+  $daemon_pid = File.new( @options[:i].to_s,'w' )
   $daemon_pid.sync = true
   $daemon_pid.puts(Process.pid.to_s)
   $daemon_pid.close
@@ -142,7 +142,7 @@ EventMachine.run {
         if data['timestamp']
           log 'notice', "request spool data > '#{Time.at(data['timestamp']).to_s}'", client_id
         else
-          log 'notice', "request spool with init data", client_id
+          log 'notice', 'request spool with init data', client_id
         end
 
         if @clients[client_id] && @clients[client_id][:session] && @clients[client_id][:session]['id']
@@ -155,7 +155,7 @@ EventMachine.run {
               log 'notice', "send spool to (user_id=#{ @clients[client_id][:session]['id'] })", client_id
               @clients[client_id][:websocket].send( "[#{ msg }]" )
             else
-              log 'notice', "send spool", client_id
+              log 'notice', 'send spool', client_id
               @clients[client_id][:websocket].send( "[#{ msg }]" )
             end
           }
@@ -164,7 +164,7 @@ EventMachine.run {
         end
 
         # send spool:sent event to client
-        log 'notice', "send spool:sent event", client_id
+        log 'notice', 'send spool:sent event', client_id
         @clients[client_id][:websocket].send( '[{"event":"spool:sent","data":{"timestamp":' + Time.now.utc.to_i.to_s + '}}]' )
       end
 
@@ -222,7 +222,7 @@ EventMachine.run {
               end
             end
           else
-            log 'notice', "do not send broadcast to it self", client_id
+            log 'notice', 'do not send broadcast to it self', client_id
           end
         }
       end
@@ -264,7 +264,7 @@ EventMachine.run {
 
   EventMachine.add_periodic_timer(0.4) {
     next if @clients.size == 0
-    log 'debug', "checking for data to send..."
+    log 'debug', 'checking for data to send...'
     @clients.each { |client_id, client|
       next if client[:disconnect]
       log 'debug', 'checking for data...', client_id
@@ -272,7 +272,7 @@ EventMachine.run {
         queue = Sessions.queue( client_id )
         if queue && queue[0]
           #          log "send " + queue.inspect, client_id
-          log 'notice', "send data to client", client_id
+          log 'notice', 'send data to client', client_id
           client[:websocket].send( queue.to_json )
         end
       rescue => e
@@ -291,14 +291,14 @@ EventMachine.run {
   }
 
   def check_unused_connections
-    log 'notice', "check unused idle connections..."
+    log 'notice', 'check unused idle connections...'
 
     idle_time_in_sec = 4 * 60
 
     # close unused web socket sessions
     @clients.each { |client_id, client|
       if ( client[:last_ping] + idle_time_in_sec ) < Time.now
-        log 'notice', "closing idle websocket connection", client_id
+        log 'notice', 'closing idle websocket connection', client_id
 
         # remember to not use this connection anymore
         client[:disconnect] = true
@@ -315,7 +315,7 @@ EventMachine.run {
     # close unused ajax long polling sessions
     clients = Sessions.destory_idle_sessions(idle_time_in_sec)
     clients.each { |client_id|
-      log 'notice', "closing idle long polling connection", client_id
+      log 'notice', 'closing idle long polling connection', client_id
     }
   end