We can obtain the current lfs version by running
luatex '\directlua{tex.write(lfs._VERSION)}\bye' && open texput.pdf
also
luatex --fmt=plain '\directlua{print(lfs._VERSION);}\bye'|grep LuaFileSystem
(if grep is available )
Then we must remove texput.pdf and texput.log.
This is a bit cumbersome.
It would be great if this information could be in the credits:
we have several lua libs (lfs, socket, lpeg md5 ...); you can always make a script
-- ver.lua
print(lfs._VERSION)
$>luatex --luaonly ver.lua
BTW, is lfs 1.8 planned in forthcoming? (1.7 does not play with windows very well)
hm could be.