Relay of 50 quineas

Quine is a computer program that produces at the output an exact copy of its source code. Japanese rubist Yusuke Endoh created something incredible. Quine Relay is a Ruby program that generates Scala program code, which generates Scheme program code, which generates ... and so on in 50 programming languages, until the REXX program again generates the original Ruby code.

To check, you must first install all the necessary environments in the system. Under Ubuntu, this can be done with this command:

$ apt-get install algol68g bash beef boo clisp clojure1.4 coffeescript \ fp-compiler g++ gauche gawk gcc gforth gfortran ghc gnat gnu-smalltalk \ gobjc golang groovy icont intercal iverilog jasmin-sable llvm lua5.2 \ make mono-devel mono-mcs nodejs ocaml octave open-cobol openjdk-6-jdk \ parrot perl php5-cli pike7.8 python r-base regina-rexx ruby1.9.3 scala \ swi-prolog tcl8.5 ucblogo valac 

Run the program with each interpreter / compiler, in turn.
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 $ ruby QR.rb > QR.scala $ scalac QR.scala && scala QR > QR.scm $ gosh QR.scm > QR.bash $ bash QR.bash > QR.st $ gst QR.st > QR.tcl $ tclsh QR.tcl > QR.unl $ ruby unlambda.rb QR.unl > QR.vala $ valac QR.vala && ./QR > QR.v $ iverilog -o QR QR.v && ./QR -vcd-none > QR.ws $ ruby whitespace.rb QR.ws > QR.adb $ gnatmake QR.adb && ./QR > QR.a68 $ a68g QR.a68 > QR.awk $ awk -f QR.awk > QR.boo $ booi QR.boo > QR.bf $ beef QR.bf > QR.c $ gcc -o QR QR.c && ./QR > QR.cpp $ g++ -o QR QR.cpp && ./QR > QR.cs $ mcs QR.cs && mono QR.exe > QR.clj $ clojure QR.clj > QR.cob $ cobc -x QR.cob && ./QR > QR.coffee $ coffee QR.coffee > QR.lisp $ clisp QR.lisp > QR.fs $ gforth QR.fs > QR.f $ gfortran -o QR QR.f && ./QR > QR.f90 $ gfortran -o QR QR.f90 && ./QR > QR.go $ go run QR.go > QR.groovy $ groovy QR.groovy > QR.hs $ runghc QR.hs > QR.icn $ icont -s QR.icn && ./QR > QR.i $ ick -b QR.i && ./QR > QR.j $ jasmin QR.j && java QR > QR.java $ javac QR.java && java QR > QR.ll $ llvm-as QR.ll && lli QR.bc > QR.logo $ ucblogo QR.logo > QR.lua $ lua QR.lua > QR.makefile $ make -f QR.makefile > QR.il $ ilasm QR.il && mono QR.exe > QR.js $ nodejs QR.js > QR.m $ gcc -o QR QR.m && ./QR > QR.ml $ ocaml QR.ml > QR.octave $ octave -qf QR.octave > QR.pasm $ parrot QR.pasm > QR.pas $ fpc QR.pas && ./QR > QR.pl $ perl QR.pl > QR.php $ php QR.php > QR.pike $ pike QR.pike > QR.prolog $ swipl -q -t qr -f QR.prolog > QR.py $ python QR.py > QR.R $ R --slave < QR.R > QR.rexx $ rexx ./QR.rexx > QR2.rb 

As a result, the final QR2.rb code does not differ from the original QR.rb.