Ever run a “top” command on a linux machine and notice a number of “zombie processes”?

Zombies are already dead processes that you really cant get rid of without a reboot.
Ususally they are harmless and take almost no resources.

To view what process ids are the zombies you can use this command from a command shell

ps aux | awk ‘{ print $8 ” ” $2 }’ | grep -w Z

This will show the pid of the zombie processes.