Capturing Output

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

capture

Demonstrates capturing exec stdout and using it as input for subsequent steps.

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 and captures its stdout (the Node version string)
  3. Interpolates the captured value into a subsequent exec command
  4. Writes a JSON file into the sandbox using the captured value
  5. Reads the file back with sb.readFile() and prints it

Reading Files

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

Running Bash Scripts

Run a multi-line bash script inside an isolated sandbox and stream its output.

On this page

captureSetupRunWhat it does