demo.java

///usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS org.zeroturnaround:zt-exec:1.12
//DEPS org.slf4j:slf4j-nop:1.7.30

import static java.lang.System.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import org.zeroturnaround.exec.*;

public class demo {

    public static void main(String... args) throws InvalidExitValueException, IOException, InterruptedException, TimeoutException {
       int count = Integer.parseInt(new ProcessExecutor().command("/bin/bash", "-c", "set -euo pipefail;ls -1 | wc -l")
        .readOutput(true).execute()
        .outputUTF8().trim());
        out.println("Files count: "+ count);
    }
}

demo.mjs

let count = parseInt(await $`ls -1 | wc -l`)
console.log(`Files count: ${count}`)