Run Linux and Node.js
in a browser tab.

uname -m
echo "hello from busybox" | tr a-z A-Z
seq 1 5 | sort -rn | head -3

const { createHash } = require("crypto");
console.log("node", process.version, process.platform, process.arch);
console.log("sha256:", createHash("sha256").update("userland.run").digest("hex").slice(0, 16));

photon in.jpg out.png --filter sepia

// Runs in the Boa sandbox (nano.script). This engine was granted the `fs` and
// `run` capabilities plus console — nothing else: no network, no DOM, no host
// JavaScript objects. The value of the last expression (awaited if it is a
// promise) comes back to the page as JSON.
(async () => {
  const dir = "/work/project";
  const files = nano.fs.list(dir).map((f) => f.name).sort();
  console.log("files:", files.join(", "));

  let total = 0;
  for (const name of files) {
    const lines = nano.fs.readText(dir + "/" + name).split("\n").filter(Boolean).length;
    total += lines;
    console.log(name.padEnd(12), lines, "lines");
  }
  console.log("total:", total, "lines");

  // `run` is a granted capability: a BusyBox applet on the RISC-V VM.
  const wc = await nano.run("wc -l " + dir + "/readme.md");
  console.log("busybox wc -l:", wc.stdout.trim());

  // Not granted: the global simply doesn't exist inside the sandbox.
  console.log("typeof fetch:", typeof fetch);

  return { files: files.length, total };
})();