This is a lua script for OpenComputers to get the size of a file (returns 0 on directories)

stat.lua

local args = {...}
local shell = require("shell")
if not args[1] then
  print("Please specify a path")
  print("stat (PATH)")
  require("os").exit()
end
local path = shell.resolve(args[1])
local fs = require("component").filesystem
if not fs.exists(path) then
  print("File does not exist")
  require("os").exit()
end
local size = math.ceil(fs.size(path))

-- Code from http://lua-users.org/wiki/SimpleRound
function round(num, numDecimalPlaces)
  local mult = 10^(numDecimalPlaces or 0)
  return math.floor(num * mult + 0.5) / mult
end
-- End

function sizeFormat(size) 
  if size < 1024 then
    return(size .. " B")
  end
  if size > 1024 and size < 1048576 then
    return(round(size / 1024, 2) .. " KiB")
  end
  if size > 1048576 and size < 1073741824 then
    return(round(size / 1048576, 2) .. " MiB")
  end
end
local bigFBios = false
if size > 4096 then
  bigFBios = true
end
print(sizeFormat(size))
if bigFBios then
  print("WARN!: Too big for eeprom")
end