cat

-- cat.lua
-- Usage: cat <file> [file2 file3 ...]

local args = { ... }
if #args == 0 then
  print("Usage: cat <file> [file2 file3 ...]")
  return
end

for _, path in ipairs(args) do
  if not fs.exists(path) then
    printError("cat: " .. path .. ": No such file")
  elseif fs.isDir(path) then
    printError("cat: " .. path .. ": Is a directory")
  else
    local f = fs.open(path, "r")
    if not f then
      printError("cat: " .. path .. ": Could not open file")
    else
      while true do
        local line = f.readLine()
        if not line then break end
        print(line)
      end
      f.close()
    end
  end
end