File I/O

Reading from a File

# Example 1: Reading the entire file at once
file_path = 'example.txt'

# Open the file in read mode
File.open(file_path, 'r') do |file|
  content = file.read
  puts "File Content:\n#{content}"
end

# Example 2: Reading line by line
File.open(file_path, 'r') do |file|
  file.each_line do |line|
    puts "Line: #{line}"
  end
end

Writing to a File

# Example 3: Writing to a file (replaces existing content)
file_path = 'example.txt'

# Open the file in write mode
File.open(file_path, 'w') do |file|
  file.puts "Hello, World!"
  file.puts "This is a new line."
end

# Example 4: Appending to a file
File.open(file_path, 'a') do |file|
  file.puts "Appending more content."
end

Checking if a File Exists

file_path = 'example.txt'

if File.exist?(file_path)
  puts "#{file_path} exists!"
else
  puts "#{file_path} does not exist."
end

Handling File Exceptions

file_path = 'nonexistent_file.txt'

begin
  File.open(file_path, 'r') do |file|
    content = file.read
    puts "File Content:\n#{content}"
  end
rescue Errno::ENOENT
  puts "File not found: #{file_path}"
rescue StandardError => e
  puts "An error occurred: #{e.message}"
end