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## Run subprocess
[API Reference](https://doc.deno.land/https/github.com/denoland/deno/releases/latest/download/lib.deno.d.ts#Deno.run)
Example:
```ts
// create subprocess
const p = Deno.run({
cmd: ["echo", "hello"],
});
// await its completion
await p.status();
```
Run it:
```shell
$ deno run --allow-run ./subprocess_simple.ts
hello
```
Here a function is assigned to `window.onload`. This function is called after
the main script is loaded. This is the same as
[onload](https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onload)
of the browsers, and it can be used as the main entrypoint.
By default when you use `Deno.run()` subprocess inherits `stdin`, `stdout` and
`stderr` of parent process. If you want to communicate with started subprocess
you can use `"piped"` option.
```ts
const fileNames = Deno.args;
const p = Deno.run({
cmd: [
"deno",
"run",
"--allow-read",
"https://deno.land/std@$STD_VERSION/examples/cat.ts",
...fileNames,
],
stdout: "piped",
stderr: "piped",
});
const { code } = await p.status();
if (code === 0) {
const rawOutput = await p.output();
await Deno.stdout.write(rawOutput);
} else {
const rawError = await p.stderrOutput();
const errorString = new TextDecoder().decode(rawError);
console.log(errorString);
}
Deno.exit(code);
```
When you run it:
```shell
$ deno run --allow-run ./subprocess.ts <somefile>
[file content]
$ deno run --allow-run ./subprocess.ts non_existent_file.md
Uncaught NotFound: No such file or directory (os error 2)
at DenoError (deno/js/errors.ts:22:5)
at maybeError (deno/js/errors.ts:41:12)
at handleAsyncMsgFromRust (deno/js/dispatch.ts:27:17)
```
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