porting to Windows

[Valerio Schiavoni <valerio.schiavoni@...>]

hello,
i'm trying to remove some unix-only code from a library to be possible
to run it on windows as well.
Not being a Windows user from a long time now, I was wondering how you
would port calls like those:

jobd_no_sandbox.lua:76:	os.execute("rm -fr "..job_file.." > /dev/null 2>&1")
splayd.lua:958:root_dir = io.popen("pwd"):read()
splayd.lua:1061:splayd.status.full_os = io.popen("uname -a"):read()

In particular, is there something in Lua to get the current-platform
directory separator on paths?
And is it possible to delete files without using the lfs module?

Thanks,
Valerio