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This article mainly introduces linux how to check whether the process exists, the article is very detailed, has a certain reference value, interested friends must read it!

In linux, you can use the ps command to see whether a process exists, which is used to display the status of the current process with the syntax "ps-ef | grep process keyword"; when the parameter is set to "ef", you can find the format of the specified process and display the process information.

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

How does linux check whether a process exists

To see if a process exists in linux, you can use the ps command.

The Linux ps (process status) command is used to display the status of the current process, similar to the task manager of windows.

Grammar

Ps [options] [--help]

Parameters:

There are so many parameters in ps. Only a few commonly used parameters are listed here and their meanings are briefly introduced.

-A lists all processes

-w display widening can display more information

-au displays more detailed information

-aux displays all itineraries that include other users

Au (x) output format:

USER PID CPU MEM VSZ RSS TTY STAT START TIME COMMAND

USER: itinerary owner

PID: pid

% CPU: occupied CPU utilization

% MEM: memory usage occupied

VSZ: size of virtual memory occupied

RSS: the amount of memory occupied

TTY: secondary device number of the terminal (minor device number of tty)

STAT: the status of the trip:

D: uninterruptible sleep state (usually IO processes)

R: in progress

S: static state

T: suspend execution

Z: does not exist but cannot be eliminated for the time being

W: there are not enough memory pages to allocate

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