aiyion

pipe.lua

#!/usr/bin/env lua

local std = require'posix.unistd'
local sio = require'posix.stdio'
local rd, wr = std.pipe()

std.write(wr, "foo\nbar\nbaz\nfood")
std.close(wr)

local file = sio.fdopen(rd, 'r')

for line in file:lines() do
  if line:match("foo") then
    print(line)
  end
end

file:close()