version: 1
id: bash-automation-basics
title: Automate a Backup with Bash
summary: Write a small shell script that archives a directory and records a success marker — a 90Days-style automation drill.
difficulty: beginner
estimatedMinutes: 25
prerequisites: [linux-shell-basics]
image: alpine:3.21
shell: /bin/sh
setup:
  - "mkdir -p /workspace/data /workspace/bin"
  - "printf 'ledger=ok\\n' > /workspace/data/app.env"
tasks:
  - id: backup-script
    title: Script the backup
    description: 'Create an executable /workspace/bin/backup.sh that archives /workspace/data into /workspace/backup.tar.gz and writes OK to /workspace/backup.status. Run the script once successfully.'
    hints:
      - 'Use tar -czf /workspace/backup.tar.gz -C /workspace data'
      - chmod +x makes the script executable.
      - Echo OK into backup.status at the end of the script.
    checks:
      - type: file
        name: Script exists
        path: /workspace/bin/backup.sh
        value: tar
      - type: command
        name: Script is executable
        command: test -x /workspace/bin/backup.sh
      - type: command
        name: Archive created
        command: test -f /workspace/backup.tar.gz
      - type: file
        name: Status marker written
        path: /workspace/backup.status
        value: OK
      - type: command
        name: Archive contains app.env
        command: tar -tzf /workspace/backup.tar.gz | grep -q 'app.env'
limits: {cpus: "0.5", memory: 128m, pids: 64, timeout: 1800, network: false}
attribution: "Adapted from 90DaysOfDevOps Linux/automation fundamentals (Michael Cade, CC BY-NC-SA 4.0). Rewritten as an interactive PlatformForge scenario."