1.10.36. fejezet, Külső process futtatása

	const promise = new Promise((resolve, reject) => {
		const scanProc = exec("scanimage -f \"%i\t%d\n\"", (error: any, stdout: any, stderr: any) => {
			if (error) {
				reject(`error: ${error.message}`)
			}
			if (stderr) {
				reject(`stderr: ${stderr}`)
			}
			resolve(stdout)
		});
	})
        try {
		const devicesStr = await promise as string
 	} catch (e) {
		console.log("exceptoin: " + e)
	}