Prepend a single line to file with Ruby

Question

I\'d like to add a single line to the top a of file with Ruby like this:

# initial file contents
something
else

# file contents after prepending \"hello\" o         


        

Answer 1

You can try this:

File.copy_stream(myfile,tempfile)
f = File.open(myfile,'w')
f.write("Hello\n#{File.open(tempfile,'r').read}")
f.close
File.delete(tempfile)