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Use Bun.spawn() to spawn a child process. 
const proc = Bun.spawn(['echo', 'hello']);

// await completion
await proc.exited;
The second argument accepts a configuration object. 
const proc = Bun.spawn(['echo', 'Hello, world!'], {
	cwd: '/tmp',
	env: {FOO: 'bar'},
	onExit(proc, exitCode, signalCode, error) {
		// exit handler
	},
});
By default, the stdout of the child process can be consumed as a ReadableStream using proc.stdout. 
const proc = Bun.spawn(['echo', 'hello']);

const output = await proc.stdout.text();
output; // => "hello\n"
See Docs > API > Child processes for complete documentation.
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