Build a practical CLI log inspector

1use std::env;
2
3fn main() {
4    let args: Vec<String> = env::args().collect();
5    if args.len() < 2 {
6        println!("usage: logtool <keyword>");
7        return;
8    }
9
10    let keyword = &args[1];
11    let sample = [
12        "INFO service started",
13        "WARN latency above threshold",
14        "ERROR database timeout",
15    ];
16
17    for line in sample {
18        if line.contains(keyword) {
19            println!("{}", line);
20        }
21    }
22}