How do you handle command line arguments in Rust?

Question

Accepted Answer

**std::env::args** or **clap** for argument parsing.

**Basic:**
```rust
use std::env;

fn main() {
    let args: Vec<String> = env::args().collect();
    let query = &args[1];
    let filename = &args[2];
    println!("Searching {} in {}", query, filename);
}
```

**Using clap:**
```rust
use clap::Parser;

#[derive(Parser)]
#[command(name = "grep")]
#[command(about = "Search for patterns")]struct Args {
    pattern: String,
    file: String,
    #[arg(short, long)]
    ignore_case: bool,
}

fn main() {
    let args = Args::parse();
    println!("Pattern: {}", args.pattern);
}
```

**Key:** std::env for simple, clap for complex.

Rust: How do you handle command line arguments in Rust?