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) 

For more information on process life-cycles click here

Tags: UNIX

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R Donato

Rick Donato is the Founder and Chief Editor of He currently works as an SDN/NFV Solutions Architect and has a keen interest in automation and the cloud.

You can find Rick on Twitter @f3lix001