How to check if a process exists in linux

In Linux, you can use the ps command to check whether the process exists. This command is used to display the status of the current process. The syntax is "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 to check whether a process exists in Linux

If you want to check whether a process exists in Linux, you can use the ps command.

Linux ps (English spelling: process status) command is used to display the status of the current process, similar to the Windows Task Manager.

Syntax

ps [options] [--help]

Parameters:

ps has many parameters. Here we only list a few commonly used parameters and briefly introduce their meanings

• -A List all processes

• -w Display widening can display more information

• -au Display wider Detailed information

• -aux Display all itineraries containing other users

au(x) Output format:

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

USER: Trip owner

• PID: pid

• ##%CPU: Occupied CPU usage

• %MEM: Occupied memory usage

• VSZ: Occupied virtual memory size

• RSS: Occupied memory Size

• TTY: Minor device number of tty

#STAT: Status of the trip:

• D: Uninterruptible sleep state (usually IO process)

• R: Executing

• S: Static state

• T: Suspended execution

• Z: Does not exist but cannot be eliminated temporarily

• W: Not enough memory pages to allocate

• <: High priority process

• N: Low priority The itinerary

• L: There are memory pages allocated and locked in the memory (real-time system or A I/O)

• START: The itinerary Start time

• TIME: Execution time

• COMMAND: Executed command

Instance

Find the specified process format:

ps -ef | grep 进程关键字

For example, display the php process:

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