ryanmjacobs

  raw = IO.popen(%W[gzip -d -c -- #{path}]){_1.read}
  raw = IO.popen(%W[gzip -d -c], in: pipe){_1.read}
  raw = IO.popen(%W[git status --porcelain -- #{path}]){_1.read}

  IO.popen(%W[gzip -d -c #{path}]){|io| io.read}

  pp open("|ls -lh /usr/bin/ls"){_1.read}
  "-rwxr-xr-x 1 root root 135K Aug 30 04:57 /usr/bin/ls\n"

  open("|column -t -s \\t", "w"){_1 << tsv_data}

  Tempfile.create(anonymous: true) removes the created temporary file
  immediately. So applications don’t need to remove the file.
  [Feature #20497]

  file = Tempfile.new.tap(&:unlink)
  file << "... some really large data to pipe"
  system("md5sum", in: file.tap(&:rewind))

  require "fcntl"

  SYS_OPEN   = 2
  O_TMPFILE  = 0x00410000
  O_RDWR     = Fcntl::O_RDWR

  def tmpfile
    mode = O_RDWR | O_TMPFILE
    fd = syscall(SYS_OPEN, "/dev/shm", mode, 0644)
    IO.for_fd(fd)
  end

  Linux 3.11 has O_TMPFILE to create an unnamed file.
  The current implementation uses it.