steam-update-verify.ts

import { parse } from "https://deno.land/std@0.112.0/flags/mod.ts";
const HELP_TEXT = `
usage: this-file <steam username> <target steam library directory> [--no-verify]
usage (as script): deno run -A ./update-verify.ts <steam username> <target steam library directory> [--no-verify]

You can alternatively specify <username> and <library> with any alias. e.g. 
	-u <username>
	--user <username>
	--username <username>
	--user=<username>
	--username=<username>
	and
	-l <library>
	--lib <library>
	--library <library>
	--lib=<library>
	--library=<library>

You can also provide the --no-verify or -n flag to skip verification
`.replace(/\t/g, " ");
if (
  ["help", "-h", "--help", "/help", "\\help", "?", "-?"]
    .includes(Deno.args[0]) ||
  Deno.args.length === 0
) {
  console.log(HELP_TEXT);
}

const parsed = parse(Deno.args, {
  alias: {
    "library": "l",
    "lib": "l",
    "user": "u",
    "username": "u",
    "no-verify": "n",
  },
  string: ["l", "u"],
  boolean: ["n"],
});

const decoder = new TextDecoder();

/** Shorthand for new TextDecoder().decode() */
function decode(input?: Uint8Array): string {
  return decoder.decode(input);
}

const present = (parsed.l && parsed.u);
let lib = parsed.l;
let user = parsed.u;
if (!present && Deno.args.length > 1) {
  user = Deno.args[0];
  lib = Deno.args[1];
} else {
  console.log(HELP_TEXT);
  Deno.exit(1);
}

const p = Deno.run({
  cmd: [
    "steamcmd",
    "+force_install_dir",
    lib,
    "+login",
    user,
    "+apps_installed",
    "+quit",
  ],
  stdout: "piped",
});
await p.status();
const output = decode(await p.output());

const games = output.split("\n").filter((v) => v.startsWith("AppID")).map(
  (v) => {
    const cols = v.split(" : ");
    return {
      id: cols[0].split(" ")[1],
      name: cols[1].slice(1, cols[1].length - 2),
      dir: cols[2].replace(" \r", ""),
    };
  },
);

for (const game of games) {
  await Deno.run({
    cmd: [
      "steamcmd",
      "+force_install_dir",
      lib,
      "+login",
      user,
      "+app_update",
      game.id,
      parsed.n ? "" : "validate",
      "+quit",
    ],
  }).status();
}

Does this still work? I get errors in both windows and linux (under wsl):

D:\Apps\steamcmd>deno run -A steam-update-verify.ts username ....\Steam
error: Uncaught NotFound: program not found
const p = Deno.run({
^
at opRun (ext:runtime/40_process.js:46:14)
at Object.run (ext:runtime/40_process.js:132:15)
at file:///D:/Apps/steamcmd/steam-update-verify.ts:59:16

This was always a bit flaky because of steamcmd being flaky, but it sounds like steamcmd isn't in your path.