Prevents blank lines from being counted or deduplicated.
| Flag | Memory usage | Speed | When to use | |------|--------------|-------|--------------| | Default (consecutive) | O(1) | Very fast | Logs, time‑ordered data | | --global | O(unique lines) | Fast | Unordered datasets, CSVs | | --global --memory=100M | ~100 MB | Medium | Files > available RAM | xtool dedup