runnerdave

# example usage: 
# listening 22
# listening java
listening() {
    if [ $# -eq 0 ]; then
        sudo lsof -iTCP -sTCP:LISTEN -n -P
    elif [ $# -eq 1 ]; then
        sudo lsof -iTCP -sTCP:LISTEN -n -P | grep -i --color $1
    else
        echo "Usage: listening [pattern]"

runnerdave

import java.io.*;
import java.util.HashMap;

class FileRecursor {
    private static HashMap<String, File> filesMap = new HashMap();
    private static long totalSize = 0;

    public static void main(String[] args) {
        System.out.println("==List all files in current directory and total size they occupy==");
        File folder = new File(".");

runnerdave

#!/bin/bash
# set -f only works when run in the prompt before executing the script, may be due to my 
# local setup
set -f

expr "${1}" "${2}" "${3}"

if [ $# -lt 3 ]
then
        echo "Usage : $0 Operand Operation Operand"

runnerdave

package com.example.reference;
import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
/*
 *  https://dzone.com/articles/java-different-types-of-references
 */
public class ReferenceExample {
       private String status ="Hi I am active";