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linux中的netstat命令

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linux中的netstat命令

  Linux系統(tǒng)中的netstat命令一般用于檢驗本機(jī)各端口的網(wǎng)絡(luò)連接情況。下面由學(xué)習(xí)啦小編為大家整理了linux中的netstat命令的相關(guān)知識,希望對大家有幫助!

  linux中的netstat命令詳解

  1.命令格式:

  netstat [-acCeFghilMnNoprstuvVwx][-A<網(wǎng)絡(luò)類型>][--ip]

  2.命令功能:

  netstat用于顯示與IP、TCP、UDP和ICMP協(xié)議相關(guān)的統(tǒng)計數(shù)據(jù),一般用于檢驗本機(jī)各端口的網(wǎng)絡(luò)連接情況。

  3.命令參數(shù):

  -a或–all 顯示所有連線中的Socket。

  -A<網(wǎng)絡(luò)類型>或–<網(wǎng)絡(luò)類型> 列出該網(wǎng)絡(luò)類型連線中的相關(guān)地址。

  -c或–continuous 持續(xù)列出網(wǎng)絡(luò)狀態(tài)。

  -C或–cache 顯示路由器配置的快取信息。

  -e或–extend 顯示網(wǎng)絡(luò)其他相關(guān)信息。

  -F或–fib 顯示FIB。

  -g或–groups 顯示多重廣播功能群組組員名單。

  -h或–help 在線幫助。

  -i或–interfaces 顯示網(wǎng)絡(luò)界面信息表單。

  -l或–listening 顯示監(jiān)控中的服務(wù)器的Socket。

  -M或–masquerade 顯示偽裝的網(wǎng)絡(luò)連線。

  -n或–numeric 直接使用IP地址,而不通過域名服務(wù)器。

  -N或–netlink或–symbolic 顯示網(wǎng)絡(luò)硬件外圍設(shè)備的符號連接名稱。

  -o或–timers 顯示計時器。

  -p或–programs 顯示正在使用Socket的程序識別碼和程序名稱。

  -r或–route 顯示Routing Table。

  -s或–statistice 顯示網(wǎng)絡(luò)工作信息統(tǒng)計表。

  -t或–tcp 顯示TCP傳輸協(xié)議的連線狀況。

  -u或–udp 顯示UDP傳輸協(xié)議的連線狀況。

  -v或–verbose 顯示指令執(zhí)行過程。

  -V或–version 顯示版本信息。

  -w或–raw 顯示RAW傳輸協(xié)議的連線狀況。

  -x或–unix 此參數(shù)的效果和指定”-A unix”參數(shù)相同。

  –ip或–inet 此參數(shù)的效果和指定”-A inet”參數(shù)相同。

  linux中的netstat命令實例

  實例1:無參數(shù)使用

  命令:

  netstat

  輸出:

  [root@localhost ~]# netstat

  Active Internet connections (w/o servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 268 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

  udp 0 0 192.168.120.204:4371 10.58.119.119:domain ESTABLISHED

  Active UNIX domain sockets (w/o servers)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

  unix 4 [ ] DGRAM 7337 /dev/log

  unix 2 [ ] DGRAM 708823

  unix 2 [ ] DGRAM 7539

  unix 3 [ ] STREAM CONNECTED 7287

  unix 3 [ ] STREAM CONNECTED 7286

  [root@localhost ~]#

  說明:

  從整體上看,netstat的輸出結(jié)果可以分為兩個部分:

  一個是Active Internet connections,稱為有源TCP連接,其中"Recv-Q"和"Send-Q"指的是接收隊列和發(fā)送隊列。這些數(shù)字一般都應(yīng)該是0。如果不是則表示軟件包正在隊列中堆積。這種情況只能在非常少的情況見到。

  另一個是Active UNIX domain sockets,稱為有源Unix域套接口(和網(wǎng)絡(luò)套接字一樣,但是只能用于本機(jī)通信,性能可以提高一倍)。

  Proto顯示連接使用的協(xié)議,RefCnt表示連接到本套接口上的進(jìn)程號,Types顯示套接口的類型,State顯示套接口當(dāng)前的狀態(tài),Path表示連接到套接口的其它進(jìn)程使用的路徑名。

  套接口類型:

  -t :TCP

  -u :UDP

  -raw :RAW類型

  --unix :UNIX域類型

  --ax25 :AX25類型

  --ipx :ipx類型

  --netrom :netrom類型

  狀態(tài)說明:

  LISTEN:偵聽來自遠(yuǎn)方的TCP端口的連接請求

  SYN-SENT:再發(fā)送連接請求后等待匹配的連接請求(如果有大量這樣的狀態(tài)包,檢查是否中招了)

  SYN-RECEIVED:再收到和發(fā)送一個連接請求后等待對方對連接請求的確認(rèn)(如有大量此狀態(tài),估計被flood攻擊了)

  ESTABLISHED:代表一個打開的連接

  FIN-WAIT-1:等待遠(yuǎn)程TCP連接中斷請求,或先前的連接中斷請求的確認(rèn)

  FIN-WAIT-2:從遠(yuǎn)程TCP等待連接中斷請求

  CLOSE-WAIT:等待從本地用戶發(fā)來的連接中斷請求

  CLOSING:等待遠(yuǎn)程TCP對連接中斷的確認(rèn)

  LAST-ACK:等待原來的發(fā)向遠(yuǎn)程TCP的連接中斷請求的確認(rèn)(不是什么好東西,此項出現(xiàn),檢查是否被攻擊)

  TIME-WAIT:等待足夠的時間以確保遠(yuǎn)程TCP接收到連接中斷請求的確認(rèn)

  CLOSED:沒有任何連接狀態(tài)

  實例2:列出所有端口

  命令:

  netstat -a

  輸出:

  [root@localhost ~]# netstat -a

  Active Internet connections (servers and established)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 0 localhost:smux *:* LISTEN

  tcp 0 0 *:svn *:* LISTEN

  tcp 0 0 *:ssh *:* LISTEN

  tcp 0 284 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

  udp 0 0 localhost:syslog *:*

  udp 0 0 *:snmp *:*

  Active UNIX domain sockets (servers and established)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ACC ] STREAM LISTENING 708833 /tmp/ssh-yKnDB15725/agent.15725

  unix 2 [ ACC ] STREAM LISTENING 7296 /var/run/audispd_events

  unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

  unix 4 [ ] DGRAM 7337 /dev/log

  unix 2 [ ] DGRAM 708823

  unix 2 [ ] DGRAM 7539

  unix 3 [ ] STREAM CONNECTED 7287

  unix 3 [ ] STREAM CONNECTED 7286

  [root@localhost ~]#

  說明:

  顯示一個所有的有效連接信息列表,包括已建立的連接(ESTABLISHED),也包括監(jiān)聽連接請(LISTENING)的那些連接。

  實例3:顯示當(dāng)前UDP連接狀況

  命令:

  netstat -nu

  輸出:

  [root@andy ~]# netstat -nu

  Active Internet connections (w/o servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  udp 0 0 ::ffff:192.168.12:53392 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:56723 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:56480 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:58154 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:44227 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:36954 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:53984 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:57703 ::ffff:192.168.9.120:10000 ESTABLISHED

  udp 0 0 ::ffff:192.168.12:53613 ::ffff:192.168.9.120:10000 ESTABLISHED

  [root@andy ~]#

  說明:

  實例4:顯示UDP端口號的使用情況

  命令:

  netstat -apu

  輸出:

  [root@andy ~]# netstat -apu

  Active Internet connections (servers and established)

  Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

  udp 0 0 *:57604 *:* 28094/java

  udp 0 0 *:40583 *:* 21220/java

  udp 0 0 *:45451 *:* 14583/java

  udp 0 0 ::ffff:192.168.12:53392 ::ffff:192.168.9.120:ndmp ESTABLISHED 19327/java

  udp 0 0 *:52370 *:* 15841/java

  udp 0 0 ::ffff:192.168.12:56723 ::ffff:192.168.9.120:ndmp ESTABLISHED 15841/java

  udp 0 0 *:44182 *:* 31757/java

  udp 0 0 *:48155 *:* 5476/java

  udp 0 0 *:59808 *:* 17333/java

  udp 0 0 ::ffff:192.168.12:56480 ::ffff:192.168.9.120:ndmp ESTABLISHED 28094/java

  udp 0 0 ::ffff:192.168.12:58154 ::ffff:192.168.9.120:ndmp ESTABLISHED 15429/java

  udp 0 0 *:36780 *:* 10091/java

  udp 0 0 *:36795 *:* 24594/java

  udp 0 0 *:41922 *:* 20506/java

  udp 0 0 ::ffff:192.168.12:44227 ::ffff:192.168.9.120:ndmp ESTABLISHED 17333/java

  udp 0 0 *:34258 *:* 8866/java

  udp 0 0 *:55508 *:* 11667/java

  udp 0 0 *:36055 *:* 12425/java

  udp 0 0 ::ffff:192.168.12:36954 ::ffff:192.168.9.120:ndmp ESTABLISHED 16532/java

  udp 0 0 ::ffff:192.168.12:53984 ::ffff:192.168.9.120:ndmp ESTABLISHED 20506/java

  udp 0 0 ::ffff:192.168.12:57703 ::ffff:192.168.9.120:ndmp ESTABLISHED 31757/java

  udp 0 0 ::ffff:192.168.12:53613 ::ffff:192.168.9.120:ndmp ESTABLISHED 3199/java

  udp 0 0 *:56309 *:* 15429/java

  udp 0 0 *:54007 *:* 16532/java

  udp 0 0 *:39544 *:* 3199/java

  udp 0 0 *:43900 *:* 19327/java

  [root@andy ~]#

  說明:

  實例5:顯示網(wǎng)卡列表

  命令:

  netstat -i

  輸出:

  [root@andy ~]# netstat -i

  Kernel Interface table

  Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg

  eth0 1500 0 151818887 0 0 0 198928403 0 0 0 BMRU

  lo 16436 0 107235 0 0 0 107235 0 0 0 LRU

  [root@andy ~]#

  說明:

  實例6:顯示組播組的關(guān)系

  命令:

  netstat -g

  輸出:

  [root@andy ~]# netstat -g

  IPv6/IPv4 Group Memberships

  Interface RefCnt Group

  --------------- ------ ---------------------

  lo 1 all-systems.mcast.net

  eth0 1 all-systems.mcast.net

  lo 1 ff02::1

  eth0 1 ff02::1:ffff:9b0c

  eth0 1 ff02::1

  [root@andy ~]#

  說明:

  實例7:顯示網(wǎng)絡(luò)統(tǒng)計信息

  命令:

  netstat -s

  輸出:

  [root@localhost ~]# netstat -s

  Ip:

  530999 total packets received

  0 forwarded

  0 incoming packets discarded

  530999 incoming packets delivered

  8258 requests sent out

  1 dropped because of missing route

  Icmp:

  90 ICMP messages received

  0 input ICMP message failed.

  ICMP input histogram:

  destination unreachable: 17

  echo requests: 1

  echo replies: 72

  106 ICMP messages sent

  0 ICMP messages failed

  ICMP output histogram:

  destination unreachable: 8

  echo request: 97

  echo replies: 1

  IcmpMsg:

  InType0: 72

  InType3: 17

  InType8: 1

  OutType0: 1

  OutType3: 8

  OutType8: 97

  Tcp:

  8 active connections openings

  15 passive connection openings

  8 failed connection attempts

  3 connection resets received

  1 connections established

  3132 segments received

  2617 segments send out

  53 segments retransmited

  0 bad segments received.

  252 resets sent

  Udp:

  0 packets received

  0 packets to unknown port received.

  0 packet receive errors

  5482 packets sent

  TcpExt:

  1 invalid SYN cookies received

  1 TCP sockets finished time wait in fast timer

  57 delayed acks sent

  Quick ack mode was activated 50 times

  60 packets directly queued to recvmsg prequeue.

  68 packets directly received from backlog

  4399 packets directly received from prequeue

  520 packets header predicted

  51 packets header predicted and directly queued to user

  1194 acknowledgments not containing data received

  21 predicted acknowledgments

  0 TCP data loss events

  1 timeouts after reno fast retransmit

  9 retransmits in slow start

  42 other TCP timeouts

  3 connections aborted due to timeout

  IpExt:

  InBcastPkts: 527777

  說明:

  按照各個協(xié)議分別顯示其統(tǒng)計數(shù)據(jù)。如果我們的應(yīng)用程序(如Web瀏覽器)運(yùn)行速度比較慢,或者不能顯示W(wǎng)eb頁之類的數(shù)據(jù),那么我們就可以用本選項來查看一下所顯示的信息。我們需要仔細(xì)查看統(tǒng)計數(shù)據(jù)的各行,找到出錯的關(guān)鍵字,進(jìn)而確定問題所在。

  實例8:顯示監(jiān)聽的套接口

  命令:

  netstat -l

  輸出:

  [root@localhost ~]# netstat -l

  Active Internet connections (only servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 0 localhost:smux *:* LISTEN

  tcp 0 0 *:svn *:* LISTEN

  tcp 0 0 *:ssh *:* LISTEN

  udp 0 0 localhost:syslog *:*

  udp 0 0 *:snmp *:*

  Active UNIX domain sockets (only servers)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ACC ] STREAM LISTENING 708833 /tmp/ssh-yKnDB15725/agent.15725

  unix 2 [ ACC ] STREAM LISTENING 7296 /var/run/audispd_events

  [root@localhost ~]#

  說明:

  實例9:顯示所有已建立的有效連接

  命令:

  netstat -n

  輸出:

  [root@localhost ~]# netstat -n

  Active Internet connections (w/o servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 268 192.168.120.204:22 10.2.0.68:62420 ESTABLISHED

  Active UNIX domain sockets (w/o servers)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

  unix 4 [ ] DGRAM 7337 /dev/log

  unix 2 [ ] DGRAM 708823

  unix 2 [ ] DGRAM 7539

  unix 3 [ ] STREAM CONNECTED 7287

  unix 3 [ ] STREAM CONNECTED 7286

  [root@localhost ~]#

  說明:

  實例10:顯示關(guān)于以太網(wǎng)的統(tǒng)計數(shù)據(jù)

  命令:

  netstat -e

  輸出:

  [root@localhost ~]# netstat -e

  Active Internet connections (w/o servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State User Inode

  tcp 0 248 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED root 708795

  Active UNIX domain sockets (w/o servers)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ] DGRAM 1491 @/org/kernel/udev/udevd

  unix 4 [ ] DGRAM 7337 /dev/log

  unix 2 [ ] DGRAM 708823

  unix 2 [ ] DGRAM 7539

  unix 3 [ ] STREAM CONNECTED 7287

  unix 3 [ ] STREAM CONNECTED 7286

  [root@localhost ~]#

  說明:

  用于顯示關(guān)于以太網(wǎng)的統(tǒng)計數(shù)據(jù)。它列出的項目包括傳送的數(shù)據(jù)報的總字節(jié)數(shù)、錯誤數(shù)、刪除數(shù)、數(shù)據(jù)報的數(shù)量和廣播的數(shù)量。這些統(tǒng)計數(shù)據(jù)既有發(fā)送的數(shù)據(jù)報數(shù)量,也有接收的數(shù)據(jù)報數(shù)量。這個選項可以用來統(tǒng)計一些基本的網(wǎng)絡(luò)流量)

  實例11:顯示關(guān)于路由表的信息

  命令:

  netstat -r

  輸出:

  [root@localhost ~]# netstat -r

  Kernel IP routing table

  Destination Gateway Genmask Flags MSS Window irtt Iface

  192.168.120.0 * 255.255.255.0 U 0 0 0 eth0

  192.168.0.0 192.168.120.1 255.255.0.0 UG 0 0 0 eth0

  10.0.0.0 192.168.120.1 255.0.0.0 UG 0 0 0 eth0

  default 192.168.120.240 0.0.0.0 UG 0 0 0 eth0

  [root@localhost ~]#

  說明:

  實例12:列出所有 tcp 端口

  命令:

  netstat -at

  輸出:

  [root@localhost ~]# netstat -at

  Active Internet connections (servers and established)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 0 localhost:smux *:* LISTEN

  tcp 0 0 *:svn *:* LISTEN

  tcp 0 0 *:ssh *:* LISTEN

  tcp 0 284 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED

  [root@localhost ~]#

  說明:

  實例13:統(tǒng)計機(jī)器中網(wǎng)絡(luò)連接各個狀態(tài)個數(shù)

  命令:

  netstat -a | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

  輸出:

  [root@localhost ~]# netstat -a | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

  ESTABLISHED 1

  LISTEN 3

  [root@localhost ~]#

  說明:

  實例14:把狀態(tài)全都取出來后使用uniq -c統(tǒng)計后再進(jìn)行排序

  命令:

  netstat -nat |awk '{print }'|sort|uniq -c

  輸出:

  [root@andy ~]# netstat -nat |awk '{print }'|sort|uniq -c

  14 CLOSE_WAIT

  1 established)

  578 ESTABLISHED

  1 Foreign

  43 LISTEN

  5 TIME_WAIT

  [root@andy ~]# netstat -nat |awk '{print }'|sort|uniq -c|sort -rn

  576 ESTABLISHED

  43 LISTEN

  14 CLOSE_WAIT

  5 TIME_WAIT

  1 Foreign

  1 established)

  [root@andy ~]#

  說明:

  實例15:查看連接某服務(wù)端口最多的的IP地址

  命令:

  netstat -nat | grep "192.168.120.20:16067" |awk '{print }'|awk -F: '{print }'|sort|uniq -c|sort -nr|head -20

  輸出:

  [root@andy ~]# netstat -nat | grep "192.168.120.20:16067" |awk '{print }'|awk -F: '{print }'|sort|uniq -c|sort -nr|head -20

  8 10.2.1.68

  7 192.168.119.13

  6 192.168.119.201

  6 192.168.119.20

  6 192.168.119.10

  4 10.2.1.199

  3 10.2.1.207

  2 192.168.120.20

  2 192.168.120.15

  2 192.168.119.197

  2 192.168.119.11

  2 10.2.1.206

  2 10.2.1.203

  2 10.2.1.189

  2 10.2.1.173

  1 192.168.120.18

  1 192.168.119.19

  1 10.2.2.227

  1 10.2.2.138

  1 10.2.1.208

  [root@andy ~]#

  說明:

  實例16:找出程序運(yùn)行的端口

  命令:

  netstat -ap | grep ssh

  輸出:

  [root@andy ~]# netstat -ap | grep ssh

  tcp 0 0 *:ssh *:* LISTEN 2570/sshd

  tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.1.205:54508 ESTABLISHED 13883/14

  tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.0.68:62886 ESTABLISHED 20900/6

  tcp 0 0 ::ffff:192.168.120.206:ssh ::ffff:10.2.2.131:52730 ESTABLISHED 20285/sshd: root@no

  unix 2 [ ACC ] STREAM LISTENING 194494461 20900/6 /tmp/ssh-cXIJj20900/agent.20900

  unix 3 [ ] STREAM CONNECTED 194307443 20285/sshd: root@no

  unix 3 [ ] STREAM CONNECTED 194307441 20285/sshd: root@no

  [root@andy ~]#

  說明:

  實例17:在 netstat 輸出中顯示 PID 和進(jìn)程名稱

  命令:

  netstat -pt

  輸出:

  [root@localhost ~]# netstat -pt

  Active Internet connections (w/o servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

  tcp 0 248 192.168.120.204:ssh 10.2.0.68:62420 ESTABLISHED 15725/0

  [root@localhost ~]#

  說明:

  netstat -p 可以與其它開關(guān)一起使用,就可以添加 “PID/進(jìn)程名稱” 到 netstat 輸出中,這樣 debugging 的時候可以很方便的發(fā)現(xiàn)特定端口運(yùn)行的程序。

  實例18:找出運(yùn)行在指定端口的進(jìn)程

  命令:

  netstat -anpt | grep ':16064'

  輸出:

  [root@andy ~]# netstat -anpt | grep ':16064'

  tcp 0 0 :::16064 :::* LISTEN 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.201:6462 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:26341 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:32208 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:192.168.119.20:32207 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:51303 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:51302 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50020 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50019 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56155 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50681 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:50680 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:52136 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56989 ESTABLISHED 24594/java

  tcp 0 0 ::ffff:192.168.120.20:16064 ::ffff:10.2.1.68:56988 ESTABLISHED 24594/java

  [root@andy ~]#

  說明:

  運(yùn)行在端口16064的進(jìn)程id為24596,再通過ps命令就可以找到具體的應(yīng)用程序了。

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