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如何解释 ps 输出的“控制终端”代码？

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如何解释 ps 输出的“控制终端”代码？

ps 的控制终端输出列出了“Ss+”。我如何确定这些代码的含义？我尝试翻阅ps手册，这是一份30页的文档，我没有找到任何解释。

答案1

从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

答案2

tt从ps输出中查找列并使用tty命令，如下所示：

$ps ax |more
  PID   TT  STAT      TIME COMMAND
    1   ??  Ss     4:58.84 /sbin/launchd
   66   ??  Ss     1:05.03 /usr/sbin/syslogd
   67   ??  Ss     0:21.62 /usr/libexec/UserEventAgent (System)


$ps ax |grep bash
81939 s000  S+     0:00.09 -bash
82152 s001  S      0:00.04 -bash
82228 s001  S+     0:00.00 grep -I bash


$tty
/dev/ttys001


$ps ax |grep offlineimap-load
82261 s000  S+     0:00.02 /bin/bash /Users/pbarganski/Documents/bin/offlineimap-load
82417 s001  R+     0:00.01 grep -i offlineimap-load

从上面，tty命令告诉我当前所在的终端 - 终端's000'在这种情况下。

从最后一个命令中，您会注意到该grep -i命令是从终端运行的s001，但是，我当前的终端窗口离线imap加载脚本正在从控制终端运行s000- 我的第一个终端会话 - 在本例中，只是terminal.app 中的第一个选项卡终端。

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