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Common OpenSSL Commands with Keys and Certificates

SSL Info

Generate RSA private key with certificate in a single command

openssl req -x509 -newkey rsa:4096 -sha256 -keyout example.key -out example.crt -subj "/CN=example.com" -days 3650 -passout pass:foobar

Generate Certificate Signing Request (CSR) from private key with passphrase

openssl x509 -x509toreq -in example.crt -out example.csr -signkey example.key -passin pass:foobar

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/**
 * calculating from a string of polish postfix notation
 * @param str: String of polish postfix notation
 * @returns {*}
 */
function polishPostfix(str) {
    let arr = str.split(' ');
    let st = [];
    for (let item of arr) {
        // console.log(st, item);

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let tmparr;
// your code here
function findMaxPathLength(map, row, col) {
    tmparr = new Array(row).fill(new Array(col).fill(-1));
    let max = 0;
    for (let i = 0; i < row; i++) {
        for (let j = 0; j < col; j++) {
            let x = recur(map, i, j);
            if (max < x) {
                max = x;

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Kafka Cheat Sheet

1. Start kafka server

# Using docker
Docker —rm -d —name Kafka -e KAFKA_CREATE_TOPICS=test:1:1 wurstmeister/kafka -p 9092 9092 
# Using OS
nohup bin/zookeeper-server-start.sh config/zookeeper.properties &
nohup bin/kafka-server-start.sh config/server.properties &

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#!/bin/bash

# Downloading packages
wget http://ftp.it.debian.org/debian/pool/main/g/gconf/gconf2_3.2.6-8_amd64.deb
wget http://ftp.it.debian.org/debian/pool/main/g/gconf/libgconf-2-4_3.2.6-8_amd64.deb
wget http://ftp.it.debian.org/debian/pool/main/g/gconf/gconf2-common_3.2.6-8_all.deb
wget http://ftp.it.debian.org/debian/pool/main/g/gconf/gconf-service_3.2.6-8_amd64.deb
wget http://ftp.it.debian.org/debian/pool/main/o/openldap/libldap-2.5-0_2.5.13%2bdfsg-5_amd64.deb

# Configuring the libgconf-2-4 package