{
  "id": "linux-inspect-hardware",
  "title": "Inspect What This Machine Actually Has",
  "category": "Linux Fundamentals",
  "isolation_type": "shared_namespace",
  "difficulty": "Easy",
  "type": "task",
  "weight": 3,
  "description": "## Inspect What This Machine Actually Has\n\nThe kernel manages CPU, memory, and storage on behalf of every process running here — before you go further, look at what's actually available.\n\n**Your task:**\n\n1. Find the number of CPUs available (`nproc`)\n2. Find the total memory in MB (`free -m`)\n3. Find the size of the root filesystem in GB (`df -BG /`)\n4. Create a file at `/srv/hardware-lab/report.txt` with exactly three lines in this format (replace `<n>` with the real numbers you found):\n\n```\nCPUS=<n>\nMEM_MB=<n>\nDISK_GB=<n>\n```",
  "hints": [
    {
      "title": "Getting each number",
      "body": "`nproc` alone prints the CPU count. `free -m` prints a table — the second column of the `Mem:` row is total memory in MB. `df -BG /` prints a table — the second column of the second row is the root filesystem size in GB (the number, not including the trailing G).",
      "command": "nproc; free -m; df -BG /"
    },
    {
      "title": "Writing the report",
      "body": "Use a heredoc or several `echo` lines with `>>` to build the file.",
      "command": "mkdir -p /srv/hardware-lab && cat <<EOF > /srv/hardware-lab/report.txt\nCPUS=$(nproc)\nMEM_MB=$(free -m | awk '/Mem:/ {print $2}')\nDISK_GB=$(df -BG / | awk 'NR==2{gsub(\"G\",\"\",$2); print $2}')\nEOF"
    }
  ],
  "setup_commands": [
    { "command": "mkdir -p /srv/hardware-lab" }
  ],
  "validation": {
    "commands": [
      { "description": "report.txt exists and has a CPUS line", "command": "grep -E '^CPUS=[0-9]+$' /srv/hardware-lab/report.txt", "expected_output": "^CPUS=[0-9]+$", "match": "regex" },
      { "description": "report.txt has a MEM_MB line", "command": "grep -E '^MEM_MB=[0-9]+$' /srv/hardware-lab/report.txt", "expected_output": "^MEM_MB=[0-9]+$", "match": "regex" },
      { "description": "report.txt has a DISK_GB line", "command": "grep -E '^DISK_GB=[0-9]+$' /srv/hardware-lab/report.txt", "expected_output": "^DISK_GB=[0-9]+$", "match": "regex" }
    ]
  },
  "default_namespace": "default",
  "teardown_commands": [
    { "command": "rm -rf /srv/hardware-lab" }
  ]
}