Append to file

• append

if ARGV.size != 2
  puts "Need a filename and the content to write to it on the command line"
  exit 1
end
filename, content = ARGV

File.write(filename, content, mode: "a")

• This is a bug in my code, but it still creates the file with some strange rights ---xr-Sr--

File.write("out.txt", "content", mode = "a")

• The ameba linter will catch this error.