ps参数比较多，根据需要 显示进程的信息。比如进程的启动时间，运行时间，状态，
参数
参数 -e 显示所有进程信息，-o 参数控制输出。Pid,User 和 Args参数显示PID，运行应用的用户和该应用。
-u 显示用户进程
ps -efww //david 常用
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 2016 ? 00:00:02 /sbin/init
root 2 0 0 2016 ? 00:00:00 [kthreadd]
ps -aux //bean
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 24588 1224 ? Ss 2016 0:02 /sbin/init
root 2 0.0 0.0 0 0 ? S 2016 0:00 [kthreadd]
ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 2016 ? 00:00:02 /sbin/init
root 2 0 0 2016 ? 00:00:00 [kthreadd]
root 3 2 0 2016 ? 00:34:18 [ksoftirqd/0]
ps -eF
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 6147 1224 11 2016 ? 00:00:02 /sbin/init
root 2 0 0 0 0 10 2016 ? 00:00:00 [kthreadd]
root 3 2 0 0 0 0 2016 ? 00:34:18 [ksoftirqd/0]
root 5 2 0 0 0 0 2016 ? 00:00:00 [kworker/0:0H]
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.
查看进程的线程
ps -eLf #L要大写，其中LWP ，light weighted process，代表thread
UID PID PPID LWP C NLWP STIME TTY TIME CMD
root 1 0 1 0 1 Oct30 ? 00:08:28 /sbin/init
root 2 0 2 0 1 Oct30 ? 00:03:56 [kthreadd]
root 3 2 3 0 1 Oct30 ? 00:20:07 [ksoftirqd/0]
root 5 2 5 0 1 Oct30 ? 00:00:00 [kworker/0:0H]
root 7 2 7 0 1 Oct30 ? 00:55:00 [rcu_sched]
root 8 2 8 0 1 Oct30 ? 00:00:00 [rcu_bh]
root 9 2 9 0 1 Oct30 ? 00:07:19 [migration/0]
root 10 2 10 0 1 Oct30 ? 00:00:04 [watchdog/0]
查看 进程的 运行时间
root@BTDISK-12:~# ps -C atop -o etime,pid,cmd
ELAPSED PID CMD
00:29 654009 /usr/bin/atop -a -w /var/log/atop.log 600
