What are the process states in Unix?

As a process executes it changes state according to its circumstances. Unix processes have the following states:

  • Running : The process is either running or it is ready to run .
  • Waiting : The process is waiting for an event or for a resource.
  • Stopped : The process has been stopped, usually by receiving a signal.
  • Zombie : The process is dead but have not been removed from the process table.