UNIX – Process State Codes

O – On processor — the process is executing on the CPU in either user or system mode.
R – Runnable — the process is on a run queue and is running or runnable.
S – Sleeping — the process is waiting for a I/O event to complete.
Z – zombie — process, terminated but not reaped by its parent.
T – stopped — process has been stopped
X – dead — (should never be seen)

Rick Donato
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