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ChildProcess.prototype.pid - child_process - Node documentation
property ChildProcess.prototype.pid

Usage in Deno

import { ChildProcess } from "node:child_process";

Returns the process identifier (PID) of the child process. If the child process fails to spawn due to errors, then the value is undefined and error is emitted.

import { spawn } from 'node:child_process';
const grep = spawn('grep', ['ssh']);

console.log(`Spawned child pid: ${grep.pid}`);
grep.stdin.end();

Type

number | undefined