Get containing path of lua file

Question

I am wondering if there is a way of getting the path to the currently executing lua script file?

This is specifically not the current working directory, which could be

Answer 1

As lhf says:

~ e$ echo "print(arg[0])" > test.lua
~ e$ lua test.lua
test.lua
~ e$ cd /
/ e$ lua ~/test.lua
/Users/e/test.lua
/ e$ 

Here's the same info using the debug.getinfo mechanism

~ e$ echo "function foo () print(debug.getinfo(1).source) end; foo()" > test.lua
~ e$ lua test.lua
@test.lua
~ e$ cd /
/ e$ lua ~/test.lua
@/Users/e/test.lua
/ e$ 

This is available from the C API lua_getinfo