# anew
> Add new lines to files, skipping duplicates

## Summary
Append unique lines to files while skipping existing duplicates

## Capabilities
- Append new lines to files
- Skip lines that already exist
- Build unique line collections

## When to Use
- When building deduplicated lists incrementally
- When appending only new data to files

## When NOT to Use
- When you need to remove duplicates from existing files

## Related Tools
- [huniq](/tools/huniq) (complementary)

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Source: https://littlescripts.sh/tools/anew
