Improved tutorial startup script

/** @param {NS} ns */
export async function main(ns) {
    // Array of all servers that don't need any ports opened
    // to gain root access. These have 16 GB of RAM
    const servers0Port = ["sigma-cosmetics",
                        "joesguns",
                        "nectar-net",
                        "hong-fang-tea",
                        "harakiri-sushi"];

    // Array of all servers that only need 1 port opened
    // to gain root access. These have 32 GB of RAM
    const servers1Port = ["neo-net",
                        "zer0",
                        "max-hardware",
                        "iron-gym"];

        const script_filename = 'early-hack-template.js';

        //const script_ram = 2.6;       // GB, Memory usage of original original script.
        const script_ram = ns.getScriptRam(script_filename);

        // Calculate how many threads of the script we can run on a system
        // with 16 and 32 GB of RAM.
        const threads16 = Math.max(1, Math.floor(script_ram / 16) );
        const threads32 = Math.max(1, Math.floor(script_ram / 32) );

    // Copy our scripts onto each server that requires 0 ports
    // to gain root access. Then use nuke() to gain admin access and
    // run the scripts.
    for (let i = 0; i < servers0Port.length; ++i) {
        const serv = servers0Port[i];

        if (ns.scp(script_filename, serv) === false) {
                    ns.tprint(`ERROR: copying '${script_filename} to "${serv}"`);
                    continue;   // Skip to next server in the for loop
                }
        ns.nuke(serv);
        let pid = ns.exec(script_filename, serv, threads16);
                if (pid === 0) {
                    ns.tprint(`ERROR: Unable to execute ${script_filename} on "${serv}"`);
                }
    }

    // Wait until we acquire the "BruteSSH.exe" program
    while (!ns.fileExists("BruteSSH.exe")) {
                ns.print("Waiting for BruteSSH.exe to be purchased or created.");
        await ns.sleep(60 * 1000);  // 60 secs or 60000 milliseconds
    }



    // Copy our scripts onto each server that requires 1 port
    // to gain root access. Then use brutessh() and nuke()
    // to gain admin access and run the scripts.
    for (let i = 0; i < servers1Port.length; ++i) {
        const serv = servers1Port[i];

        if (ns.scp(script_filename, serv) === false) {
                    ns.tprint(`ERROR: copying '${script_filename} to "${serv}"`);
                    continue;   // Skip to next server in the for loop
                }
        ns.brutessh(serv);
        ns.nuke(serv);
        let pid = ns.exec(script_filename, serv, threads32);
                if (pid === 0) {
                    ns.tprint(`ERROR: Unable to execute ${script_filename} on "${serv}"`);
                }
    }
}