function::ppid - Linux

Overview

ppid is a command that prints the process ID of the parent process of the current process. This is useful for determining which process launched the current process.

Syntax

ppid

Options/Flags

None

Examples

$ ppid
1

In this example, the ppid command prints the process ID of the current process’s parent process, which is 1. This means that the current process was launched by the init process.

Common Issues

If the ppid command does not print anything, it is likely that the current process does not have a parent process. This can happen if the current process was launched directly from the kernel, or if the parent process has already terminated.

Integration

The ppid command can be used with other Linux commands to get more information about the current process. For example, the following command will print the name of the parent process of the current process:

ps -p $(ppid) -o comm=

Related Commands

• pgrep
• pkill
• ps