Reading Files

Read a file written inside the sandbox back to the host process.

read-file

Demonstrates sb.readFile() — reading a file written inside the sandbox back to the host process.

Setup

bunx alineo-cli init   # starts OpenSandbox in Docker (one-time setup)

Run

bun install
bun start

What it does

  1. Creates a node:20-slim sandbox
  2. Runs a Node.js one-liner that writes the Node version to /tmp/version.txt
  3. Reads the file back using sb.readFile()
  4. Writes a JSON report to the sandbox using sb.writeFile() and reads it back
  5. Prints both captured values to the console

File Operations

The full sandbox file operations API — read, write, move, search, and transfer.

Capturing Output

Capture exec stdout and use it as input for subsequent steps.

On this page

read-fileSetupRunWhat it does