Hi Reuben > You need to compile these executables in chkrootkit directory > before executing it. Run a 'make all' under the chkrootkit directory. Gosh - I feel just like a newbie Linux person... HANG ON! I *am* a newbie Linux person.. Many thanks to you and all others who have responded for the advice. It's all much appreciated! I'm having fun here. ;) Regards Chris