How to find the parent process ID (PPID) in Linux

In the Linux operating system, each running program is a process, and each process has a unique process identifier (PID).

Similarly, each process will have a parent process, which is the process that created it. The identifier of the parent process is called the parent process ID (PPID).

In this article, we will explore how to find the ID of the parent process in a Linux system and introduce some effective commands and tools to help you get detailed information about the relationship between processes.

Basic command to find parent process ID

First, I will give you a brief introduction to a few basic commands that can be used to view all processes running in the system and their parent process IDs.

Use the ps command to view process information

The

ps command is a powerful tool that reports information about the current process.

The following are some basic ps command usage:

# 查看当前终端关联的进程信息
ps -e

# 以详细的格式显示所有进程信息
ps aux

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