sample-lines 1.2.0

Command-line tool to sample lines from a file or stdin without replacement. It runs in one pass without reading the whole input into memory using reservoir sampling.
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# sample-lines

`samp` is a fast command-line tool to randomly sample
lines from a file or standard input using [reservoir
sampling](https://en.wikipedia.org/wiki/Reservoir_sampling). It
samples uniformly without replacement.

Good for:
- Downsampling large datasets
- Sampling logs for debugging
- Creating reproducible random subsets of data

## Installation

If you have Rust installed, you can install `samp` with:

```bash
cargo install sample-lines
```

Or build it from source:

```bash
git clone https://github.com/stringertheory/sample-lines.git
cd sample-lines
cargo build --release
```

## Usage

```bash
samp -n <NUM> [--seed <SEED>] [FILE]
```

Here are a few examples:

```bash
samp --help
cat data.txt | samp -n 10
samp -n 10 data.txt
samp -n 10 < data.txt
samp -n 10 --seed 17 < data.txt
cat data.csv | samp -n 10 --preserve-headers
```

### Options

| Option | Description |
|--------|-------------|
| `-n <NUM>` | Number of lines to sample (**required**) |
| `--seed <SEED>` | Optional seed for reproducible sampling |
| `-p, --preserve-headers [N]` | Preserve the first `N` lines as headers (default: 1 if flag is used) |
| `-h`, `--help` | Show help message |
| `--version` | Show the version number |

## Testing

```bash
cargo clean
cargo build # need binary for testing stdin/stderr
cargo test
```

## License

Licensed under the [MIT License](LICENSE).

## Contributing

Issues and pull requests welcome! If you have an idea, a feature
request, or a bug report, feel free to open an issue or PR.