env.lua

来自「这个是脚本引擎lua的例程,这是一个嵌入式的袖珍引擎」· LUA 代码 · 共 8 行

-- read environment variables as if they were global variables

local f=function (t,i) return os.getenv(i) end
setmetatable(getfenv(),{__index=f})

-- an example
print(a,USER,PATH)