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```typescript
// AI Dev Tool: Btrfs-ZFS-bcachefs Benchmarking CLI
// =============================================
// A high-performance, production-ready CLI automation tool for benchmarking Btrfs, ZFS, and bcachefs under various workloads.

import { Command } from 'commander';
import { spawnSync } from 'child_process';
import { existsSync, mkdirSync, writeFileSync } from 'fs';
import { join } from 'path';

// Define the CLI program
const program = new Command();

// Define the benchmarking options
interface BenchmarkOptions {
  filesystem: 'btrfs' | 'zfs' | 'bcachefs';
  workload: 'classic' | 'io-bound' | 'cpu-bound';
  outputDir: string;
}

// Define the benchmarking function
async function benchmark(options: BenchmarkOptions) {
  const { filesystem, workload, outputDir } = options;

// Create the output directory if it doesn't exist
  if (!existsSync(outputDir)) {
    mkdirSync(outputDir, { recursive: true });
  }

// Run the benchmarking command
  const command = `./benchmark_${filesystem}_${workload}.sh`;
  const result = spawnSync(command, [], { stdio:

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