The process states indicated by “ps” command are:
D : uninterrupted sleep (usually an I/O)
R : running or executable (in the execution queue)
S : interruptible sleep (waiting for an event to be completed)
T : stopped, either by a control signal from the Job
W : paging
X : dead (should never be seen)
Z : (“zombie”) process, ended without the parent process being aware of it
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