OS第1次实验报告：熟悉使用Linux命令和剖析ps命令

• 姓名  邹文兵
• 学号  201821121028
• 班级  计算1811

1. 实验环境介绍

给出实验环境：

• 操作系统：Ubuntu 18.04.3 LTS
• 平台：双操作系统(Win10+Ubuntu18.04)

2. 常用命令使用

3. 剖析ps命令

运行man ps，将ps使用方法拷贝过来，比如：

SYNOPSIS
       ps [options]
EXAMPLES
       To see every process on the system using standard syntax:
          ps -e
          ps -ef
          ps -eF
          ps -ely

       To see every process on the system using BSD syntax:
          ps ax
          ps axu

       To print a process tree:
          ps -ejH
          ps axjf

       To get info about threads:
          ps -eLf
          ps axms

       To get security info:
          ps -eo euser,ruser,suser,fuser,f,comm,label
          ps axZ
          ps -eM

       To see every process running as root (real & effective ID) in user format:
          ps -U root -u root u

       To see every process with a user-defined format:
          ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
          ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm
          ps -Ao pid,tt,user,fname,tmout,f,wchan

       Print only the process IDs of syslogd:
          ps -C syslogd -o pid=

       Print only the name of PID 42:
          ps -q 42 -o comm=

（1）运行ps -ef，系统的返回结果：

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 3月06 ?       00:00:11 /sbin/init splash
root         2     0  0 3月06 ?       00:00:00 [kthreadd]
root         3     2  0 3月06 ?       00:00:00 [rcu_gp]
root         4     2  0 3月06 ?       00:00:00 [rcu_par_gp]
root         6     2  0 3月06 ?       00:00:00 [kworker/0:0H-kb]

UID : 用户的ID  PID ： 进程标识符  PPID ：父进程标识符     C ：CPU占用的百分比  STIME ：进程开始的时间    TTY ：登入者的终端机位置 TIME ：使用掉的CPU时间CMD ：所下达的指令为啥

:/home/zouwenbin# ps -ely
S   UID   PID  PPID  C PRI  NI   RSS    SZ WCHAN  TTY          TIME CMD
S     0     1     0  0  80   0  9448 56426 ep_pol ?        00:00:17 systemd
S     0     2     0  0  80   0     0     0 kthrea ?        00:00:00 kthreadd
I     0     3     2  0  60 -20     0     0 rescue ?        00:00:00 rcu_gp
I     0     4     2  0  60 -20     0     0 rescue ?        00:00:00 rcu_par_gp
I     0     6     2  0  60 -20     0     0 worker ?        00:00:00 kworker/0:0H-kb

解释命令中参数的含义:

4. 通过该实验产生新的疑问及解答