PS 命令STAT状态

常用的ps命令有：

ps -ef

或者

ps aux

这些命令显示的进程列表头中有一项STAT，其中各个状态字符的解释

           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

还可能有额外的字符对进程的状态做补充说明:

           <    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

比如，常见的状态有：
Ss：可中断的休眠(待唤醒)；会话
Ssl：可中断的休眠(待唤醒)；会话；是一个多线程
Ssl+：可中断的休眠(待唤醒)；会话；是一个多线程；属于一个前台的进程组
S<：可中断的休眠(待唤醒)；高优先级