How to check if the service is closed in Linux

Linux method to check whether the service is closed: 1. Use the ps command, which can check the processes in the system. The syntax is "ps aux | grep service name"; 2. Use the netstat command, which is used to Display network status, the syntax is "netstat -tunple | grep service port".

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

How to check if the service is closed in Linux

1.# ps aux | grep service name (ps parameters can be used upside down, no problem)

PS is one of the Linux system commands. It is a command to view the process in Linux. ps to view the running process, ps aux to view all processes.

The Linux process has 5 states

• Running state (running or waiting in the run queue [Ready Queue])

• Interrupted state (sleeping, blocked, waiting for a certain condition to form or receiving a signal)

• Uninterruptible state (not waking up and not running when receiving a signal, process Must wait until an interrupt occurs)

• Zombie state (the process has been terminated, but the process descriptor exists until the parent process calls the wait4() system call and is released)

• Stop state (the process stops running after receiving SIGSTOP, SIGSTP, SIGTIN, SIGTOU signals)

Examples are as follows:

2, # netstat -tunple | grep service port

Linux netstat command is used to display network status.

Using the netstat command allows you to know the network status of the entire Linux system.

Syntax

netstat [-acCeFghilMnNoprstuvVwx][-A<网络类型>][--ip]

Parameter description:

-a or --all Display all sockets in the connection.

-A or -- lists the relevant addresses in the connection of this network type.

-c or --continuous continuously lists network status.

-C or --cache displays the cache information of the router configuration.

-e or --extend displays other network-related information.

-F or --fib displays the route cache.

-g or --groups Display the list of multicast function group members.

-h or --help online help.

-i or --interfaces displays the network interface information form.

-l or --listening displays the Socket of the server being monitored.

-M or --masquerade displays masqueraded network connections.

-n or --numeric uses the IP address directly without going through the domain name server.

-N or --netlink or --symbolic Displays the symbolic link name of the network hardware peripheral device.

-o or --timers Display timers.

-p or --programs displays the program identification code and program name that are using Socket.

-r or --route displays the Routing Table.

-s or --statistics displays network work information statistics table.

-t or --tcp displays the connection status of the TCP transmission protocol.

-u or --udp displays the connection status of UDP transmission protocol.

-v or --verbose displays the instruction execution process.

-V or --version displays version information.

-w or --raw displays the connection status of RAW transmission protocol.

-x or --unix The effect of this parameter is the same as specifying the "-A unix" parameter.

--ip or --inet The effect of this parameter is the same as specifying the "-A inet" parameter.

Examples are as follows:

Recommended learning: Linux video tutorial

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