Ruby - Read whole text file to memory

Introduction

Read whole text file to memory

Demo

lines = File.readlines("main.rb") 
line_count = lines.size # from w w w  . j a  v  a 2s.  c  o m
text = lines.join 

puts "#{line_count} lines"

Result

File readlines method reads an entire file into an array, line by line.

You can use this both to count the lines and join them all into a single string.

Related Topic

• Output text file line by line
• Count text file line
• Count Text File Characters
• Count characters excluding whitespace
• Counting Words in Text File
• Counting Sentences and Paragraphs in Text file
• Standard Input and Output
• Text Files Reading
• Split file by ,
• Output file byte by type
• Read text file character by character
• Read an I/O stream line by line using gets
• Read entire file into an array, split by lines, using readlines
• Read an arbitrary number of bytes from a file
• Reading text file line by line using each
• Read file in UTF8
• Transcoding from one encoding to another encoding.

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