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Is there an in-built function in Ruby to read the whole file without using any loop? So far, I have only come across methods that read in chunks (line or character).
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Use File#readlines to Read Lines of a File in Ruby File#readlines takes a filename to read and returns an array of lines. Newline character \n may be included in each line. We must be cautious when working with a large file, File#readlines will read all lines at once and load them into memory.
The IO instance is the basis for all input and output operations in Ruby. Using this instance, we can read a file and get its contents line by line using the foreach() method. This method takes the name of the file, and then a block which gives us access to each line of the contents of the file.
IO.read("filename") or
File.read("filename") 
File.readlines("filename") This is also a great method to read everything from a file and break split on carriage returns. The return is an Array with one line per element.
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