Hi It's elf. A.out is not really used anymore and its libraries are provided only for compatibility. The kernel is not even capable of being compiled as a.out anymore, the last version that could do that was 2.0 series. The modules are ELF object files. HTH On Sat, Apr 28, 2001 at 07:53:55PM -0500, Gregory Nowak wrote: > Hi all, > > Is the Linux kernel and modules an a.out or elf binary?