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This "Linux system how to view the process id" article, the article sample code introduction is very detailed, with a certain reference value, interested friends must refer to, for the "Linux system how to view the process id", Xiaobian sorted out the following knowledge points, please follow the pace of the editor step by step slowly understand, then let us enter the topic.

1. Check the process occupied by the port 11. Lsof-I: Port number, view the occupancy of a port [root@localhost bin] # lsof-ilsof 8080 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME java 3511 root 46u IPv6 31351 0t0 TCP *: webcache (LISTEN) COMMAND: name, as described above 8080 is occupied by a java process PID: ID of the process Generally, when you kill a process, it is the PID USER of the specified process: process owner 2.netstat-ntlp: view all current tcp ports

Combined with grep, you can further check the occupancy of specific port numbers netstat-tunlp | grep port numbers, view port occupancy-t, display the relevant options of tcp-u, display the relevant options of udp-n, refuse to display aliases, display all the numbers converted to digits-l, and list only the service status in Listen (monitoring)-p Displays the name of the program that established the link [root@localhost bin] # netstat-tunlp | grep 8080 tcp6 00:: 8080: * LISTEN 3511/java the above result indicates that port 8080 is occupied by a Java process with a process ID of 3511 [root@ops01 ~] # netstat-tunlp | grep 3000 tcp6 00: 3000 : * LISTEN 13298/node / u01/WSS the above results indicate that port 3000 is occupied by a node program with a process ID of 13298. Query process ID 1. Ps-ef according to the program name | grep process name ps-ef shows all processes

UID: process owner PID: process ID PPID: ID C of parent program: percentage of resources used by CPU STIME: system startup time TTY: login terminal location TIME: used CPU time CMD: the name of the instruction issued, such as querying nginx related process status [root@ops01 ~] # ps-ef | grep nginx

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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