如何解釋 ps 輸出的“控制終端”程式碼？

ps 的控制終端輸出列出了“Ss+”。如何確定這些程式碼的含義？我試著翻看ps手冊，這是一個30頁的文件，我沒有找到任何解釋。

來自man ps：

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 by job control signal
          t    stopped by debugger during the tracing
          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

引用自：https://unix.stackexchange.com/questions/343753