Ruby Programming Examples

cgi script rb

ruby

#!/usr/bin/ruby

require 'cgi'
cgi = CGI.new

puts cgi.header
puts "<html><body>This is a test</body></html>"

cgi script

ruby

#!/usr/bin/ruby

puts "HTTP/1.0 200 OK"
puts "Content-type: text/html\n\n"
puts "<html><body>This is a test</body></html>"

regular expression example

ruby

#!/usr/bin/ruby

line1 = "Cats are smarter than dogs";
line2 = "Dogs also like meat";

if ( line1 =~ /Cats(.*)/ )
   puts "Line1 contains Cats"
end
if ( line2 =~ /Cats(.*)/ )
   puts "Line2 contains  Dogs"
end

using else statement

ruby

begin
   # raise 'A test exception.'
   puts "I'm not raising exception"
rescue Exception => e
   puts e.message
   puts e.backtrace.inspect
else
   puts "Congratulations-- no errors!"
ensure
   puts "Ensuring execution"
end

ensure statement

ruby

begin
   raise 'A test exception.'
rescue Exception => e
   puts e.message
   puts e.backtrace.inspect
ensure
   puts "Ensuring execution"
end

raise example

ruby

#!/usr/bin/ruby

begin  
   raise 'A test exception.'  
rescue Exception => e  
   puts e.message  
   puts e.backtrace.inspect  
end

ruby raise statement

ruby

#!/usr/bin/ruby

begin  
   puts 'I am before the raise.'  
   raise 'An error has occurred.'  
   puts 'I am after the raise.'  
rescue  
   puts 'I am rescued.'  
end  
puts 'I am after the begin block.'

ruby rescue

ruby

#!/usr/bin/ruby

begin
   file = open("/unexistant_file")
   if file
      puts "File opened successfully"
   end
rescue
      file = STDIN
end
print file, "==", STDIN, "\n"

putc statement

ruby

#!/usr/bin/ruby

str = "Hello Ruby!"
putc str

ruby puts statement

ruby

#!/usr/bin/ruby

val1 = "This is variable one"
val2 = "This is variable two"
puts val1
puts val2

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