text: the command lsof doesn't work on my linux machine?   what version of linux? what architecture? without knowing this, its hard to help; anyways, here are some things that might help:  try: apt-get install lsof or rpm -i lsof  or, if neither of those work, go here: http://freshmeat.net/projects/lsof/  at the bottom there is a list of ftp sites, you should be able to get the install package or source from there.