top stat or ps stat

PROCESS STATE CODES

       Here are the different values that the s, stat and state output specifiers (header "STAT" or "S") will display to describe

       the state of a process:

               D    uninterruptible sleep (usually IO)

               R    running or runnable (on run queue)

               S    interruptible sleep (waiting for an event to complete)

               T    stopped, either by a job control signal or because it is being traced

               W    paging (not valid since the 2.6.xx kernel)

               X    dead (should never be seen)

               Z    defunct ("zombie") process, terminated but not reaped by its parent

       For BSD formats and when the stat keyword is used, additional characters may be displayed:

               <    high-priority (not nice to other users)

               N    low-priority (nice to other users)

               L    has pages locked into memory (for real-time and custom IO)

               s    is a session leader

               l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)

               +    is in the foreground process group