Lua package 使用

设置package路径：

export LUA_PATH=$PWD/?.lua

>>package lua code:

如果在package中，不使用包名，在加载后运行时就认为是个全局的函数

utility.lua

function trim (s)
   return (string.gsub(s, "^%s*(.-)%s*$", "%1"))
end

function filesize(filename)
    local file = io.open(filename,"rb")
    local size = file:seek("end")
    io.close (file)
    return size
end

>>lua script code 

#!/home/xiaohuiy/lua/bin/lua
require "ultility"

ss="  I am a lua string  "

print (ss)

print (trim(ss));

print ("file size:")
print (filesize("aa.txt"))