luamod - list your lua module contents

luamod.lua

#!/usr/bin/lua

if #arg ~= 1 then
    io.stderr:write("usage: test_lib <lua module>\n")
    os.exit(1)
end

local req
if pcall(require, arg[1]) then
    req = require(arg[1])
else
    io.stderr:write("No such require found\n")
    os.exit(1)
end
if not req then os.exit(1) end

for k, v in pairs(req) do
    print(k, v)
end

Personally I put this script as an executable in my /usr/local/bin/ directory. Made to work for Lua 5.1, though I see no reason for it to not work with newer versions.
Usage: luamod <lua_module>, spits out all the lua modules in a list.