More about IO

The class IO has useful static methods:

IO.foreach("example.txt") { |line| puts line }
array = IO.readlines("example.txt")

Writting binary data

str = "" 
str << 1 << 2 << 3   # "\001\002\003"
str << [ 65, 66, 67, 13 ].pack("c*")
endl = "\n"
$stdout << 3.1415926 << " Some binary data: " << str << endl

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