强大的Linux：掌握PS命令的基础操作（linux常用命令ps）
In recent years, Linux has been getting more and more attention and recognition from various computer experts and users. The operating system of Linux, which is open source and distributed freely, is highly praised for its powerful functions, stability, and security. Among its many powerful commands, the “ps” command is an important and powerful tool used by administrators to view the running processes in system.
“PS” stands for “Process Status”, which is used to query the running processes on Linux, and has many useful options. It displays a list of processes and other information associated, including the process ID, the command that started the process, the user who owns the process and the priority. It can also display the environment settings of a given process, memory usage of the process and more.
The most basic usage of “ps” is to display the currently running processes on the system. A typical command looks like this:
ps -ef
The “-ef” options in the command indicates that we want to see a detailed list of all processes running on the system, including both system and user processes, and shows the owner of each process.
For example, to get a list of the process IDs (PIDs) of all the processes running on the system, we can use the following command:
ps -eo pid
The “-eo pid” option indicates that we want to see only the process ID of each running process(so only one column of output).
Many other options can be used to get information about processes. For example, to get a list of all the processes running under a certain user name:
ps -u user_name
The “-u user_name” option indicates that we want to see the processes which are running under the specified user name.
The ps command is certainly an invaluable tool in Linux and is used by a wide range of users. Knowing the basic usage and options of this command can improve our efficiency when working with Linux. Mastering the “ps” command is one way to get the most out of Linux and become an even more powerful Linux user.
