abn

#printf
RUN printf '#!/bin/bash\n\
echo hello world from line 1\n\
echo hello world from line 2'\
>> /tmp/hello

#echo
RUN echo -e '#!/bin/bash\n\
echo hello world from line 1\n\
echo hello world from line 2'\

adamjmurray

# Environment, set GEM_HOME & GEM_PATH. For example, we can launch JRuby like this:
# GEM_HOME=/Users/amurray/tmp/gems/ GEM_PATH=/Users/amurray/tmp/gems java -jar ~/Downloads/jruby-complete-1.7.0.preview1.jar -S irb

# =====================
# LISTING gems   
puts Gem::Specification.find_all.to_s
puts Gem::Specification.find_all.map{|spec| "#{spec.name} (#{spec.version})" }

# =====================
# USING (a specific version of) gems