Unix cat
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In Unix, the `cat` command is a utility that reads files and writes them to standard output. You can use Deno to mimic the behavior of the `cat` command.
In this program each command-line argument is assumed to be a filename, the file is opened, and printed to stdout (e.g. the console).
Create a script that reads the contents of one or more files and writes them to standard output.
for (const filename of Deno.args) {
const file = await Deno.open(filename);
await file.readable.pipeTo(Deno.stdout.writable, { preventClose: true });
}使用 Deno CLI 在本地运行 此示例：
deno run --allow-read cat.ts file1 file2