read_csv.lua

-- USAGE:
-- CSV_PATH=temp.csv lua5.1 read_csv.lua

local csv_path = os.getenv("CSV_PATH") or "your_file.csv"
local file = io.open(csv_path, "r")
if not file then
  print("無法打開文件: " .. csv_path)
  return
end

-- local counter = 0
local header = file:read("*line") -- for skip header
local row = {}
for line in file:lines() do
  if #line ~= 0 then
    local col = {}
    for field in line:gmatch("[^,]+") do
      table.insert(col, field)
    end
    table.insert(row, col)
    -- counter = counter + 1
  end
end
file:close()
print(row[2][3])
-- print("Total count: " .. counter)
print("Total count: " .. #row)

temp.csv