ps命令实战

约定不等于承诺〃 2021-09-19 10:46 266阅读 0赞

**一 代码**

#include<iostream>
    #include<unistd.h>
    using namespace std;
    int main(){
        for(int i=0;i<100;i++){
            cout<<"i:"<<i<<endl;
            sleep(5);
        }
        return 0;
    }

**二 编译运行**

[root@localhost charpter05]# vi 0506.cpp
    [root@localhost charpter05]# g++ 0506.cpp -o test
    [root@localhost charpter05]# ./test
    i:0

**三 ps命令实战**

1 显示指定用户

[root@localhost charpter05]# ps -u root
      PID TTY          TIME CMD
        1 ?        00:00:01 systemd
        2 ?        00:00:00 kthreadd
        3 ?        00:00:00 ksoftirqd/0
    ......
      890 ?        00:00:00 sshd
      992 ?        00:00:00 master
    1001 ?        00:00:00 sshd
    1005 pts/0    00:00:00 bash
    1026 ?        00:00:00 kworker/0:0
    1032 pts/0    00:00:00 test
    1033 ?        00:00:00 sshd
    1037 pts/1    00:00:00 bash
    1054 pts/1    00:00:00 ps

其中的test进程，正是刚刚手动运行的那个

2 显示所有进程信息

[root@localhost charpter05]# ps -ef
    UID        PID  PPID  C STIME TTY          TIME CMD
    root         1     0  0 21:34 ?        00:00:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
    root         2     0  0 21:34 ?        00:00:00 [kthreadd]
    root         3     2  0 21:34 ?        00:00:00 [ksoftirqd/0]
    root         5     2  0 21:34 ?        00:00:00 [kworker/0:0H]
    root         6     2  0 21:34 ?        00:00:00 [kworker/u2:0]
    root         7     2  0 21:34 ?        00:00:00 [migration/0]
    root         8     2  0 21:34 ?        00:00:00 [rcu_bh]
    root         9     2  0 21:34 ?        00:00:00 [rcu_sched]
    ......
    root      1001   890  0 21:37 ?        00:00:00 sshd: root@pts/0
    root      1005  1001  0 21:37 pts/0    00:00:00 -bash
    root      1026     2  0 21:39 ?        00:00:00 [kworker/0:0]
    root      1032  1005  0 21:40 pts/0    00:00:00 ./test
    root      1033   890  0 21:41 ?        00:00:00 sshd: root@pts/1
    root      1037  1033  0 21:41 pts/1    00:00:00 -bash
    root      1055  1037  0 21:42 pts/1    00:00:00 ps -ef

显示所有进程信息，连同命令行

3 ps与grep常用组合用法

[root@localhost charpter05]# ps -ef|grep test
    root      1032  1005  0 21:40 pts/0    00:00:00 ./test
    root      1057  1037  0 21:43 pts/1    00:00:00 grep --color=auto test

ps与grep常用组合用法，查找特定进程

4 将目前登入的PID与相关信息列式出来

[root@localhost charpter05]# ps -l
    F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
    4 S     0  1037  1033  0  80   0 - 28880 do_wai pts/1    00:00:00 bash
    0 R     0  1058  1037  0  80   0 - 37235 -      pts/1    00:00:00 ps

在预设的情况下，ps仅会列出与目前所在的bash shell有关的PID，所以，当使用ps -l的时候，只有2个PID

5 列出目前所有的正在内存当中的程序

[root@localhost charpter05]# ps aux
    USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
    root         1  0.3  0.6 128168  6816 ?        Ss   21:34   0:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
    root         2  0.0  0.0      0     0 ?        S    21:34   0:00 [kthreadd]
    root         3  0.0  0.0      0     0 ?        S    21:34   0:00 [ksoftirqd/0]
    root         5  0.0  0.0      0     0 ?        S<   21:34   0:00 [kworker/0:0H]
    root         6  0.0  0.0      0     0 ?        S    21:34   0:00 [kworker/u2:0]
    root         7  0.0  0.0      0     0 ?        S    21:34   0:00 [migration/0]
    root         8  0.0  0.0      0     0 ?        S    21:34   0:00 [rcu_bh]
    ......
    postfix    994  0.0  0.3  89716  4012 ?        S    21:35   0:00 qmgr -l -t unix -u
    root      1001  0.0  0.5 145784  5340 ?        Ss   21:37   0:00 sshd: root@pts/0
    root      1005  0.0  0.2 115524  2184 pts/0    Ss   21:37   0:00 -bash
    root      1026  0.0  0.0      0     0 ?        S    21:39   0:00 [kworker/0:0]
    root      1032  0.0  0.1  12496  1060 pts/0    S+   21:40   0:00 ./test
    root      1033  0.0  0.5 145784  5336 ?        Ss   21:41   0:00 sshd: root@pts/1
    root      1037  0.0  0.2 115520  2156 pts/1    Ss   21:41   0:00 -bash
    root      1059  0.0  0.1 151064  1804 pts/1    R+   21:44   0:00 ps aux