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Ivan Kaplin i-kaplin

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@bradtraversy
bradtraversy / ssh.md
Last active September 30, 2025 20:16
SSH & DevOps Crash Course Snippets

SSH Cheat Sheet

This sheet goes along with this SSH YouTube tutorial

Login via SSH with password (LOCAL SERVER)

$ ssh [email protected]

Create folder, file, install Apache (Just messing around)

$ mkdir test

$ cd test

@Yogendra0Sharma
Yogendra0Sharma / redis_cheatsheet.bash
Created January 10, 2017 10:36 — forked from LeCoupa/redis_cheatsheet.bash
Redis Cheatsheet - Basic Commands You Must Know
# Redis Cheatsheet
# All the commands you need to know
redis-server /path/redis.conf # start redis with the related configuration file
redis-cli # opens a redis prompt
# Strings.
@iSergius
iSergius / Java Collections Complexity cheatsheet
Created September 3, 2016 14:52
Below are the Big O performance of common functions of different Java Collections.
List | Add | Remove | Get | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array
@imax
imax / cheatsheet.markdown
Last active July 25, 2022 11:36
Relocation cheatsheet

Compare cost of living in different locations around the world.

Country (city) Salary (gross) Taxes Apartment Visa More info
Germany (Berlin) €50-60k 27-33% €700-1200/mo Blue Card, 1-3 months, spouse can work de_faq на русском Numbeo
Estonia (Tallinn) €35-45k 41.5% €600-1200/mo 2 months, spouse can work Taxes
xxx

Legend:

@Firefishy
Firefishy / install-letsencrypt-in-jdk.sh
Last active September 1, 2022 10:40 — forked from hedefalk/install-letsencrypt-in-jdk.sh
#!/bin/bash
set -e
JAVA_HOME=${1-text}
[ $# -eq 0 ] && { echo "Usage: sudo $0 \$(/usr/libexec/java_home -v '1.8*')" ; exit 1; }
KEYSTORE=$JAVA_HOME/jre/lib/security/cacerts
wget https://letsencrypt.org/certs/letsencryptauthorityx1.der
wget https://letsencrypt.org/certs/letsencryptauthorityx2.der
@vasanthk
vasanthk / System Design.md
Last active December 7, 2025 14:33
System Design Cheatsheet

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

  1. Clarify and agree on the scope of the system
  • User cases (description of sequences of events that, taken together, lead to a system doing something useful)
    • Who is going to use it?
    • How are they going to use it?
@xkr47
xkr47 / letsencrypt-jetty.sh
Last active May 4, 2025 13:59
How to use Letsencrypt certificate & private key with Jetty
# input: fullchain.pem and privkey.pem as generated by the "letsencrypt-auto" script when run with
# the "auth" aka "certonly" subcommand
# convert certificate chain + private key to the PKCS#12 file format
openssl pkcs12 -export -out keystore.pkcs12 -in fullchain.pem -inkey privkey.pem
# convert PKCS#12 file into Java keystore format
keytool -importkeystore -srckeystore keystore.pkcs12 -srcstoretype PKCS12 -destkeystore keystore.jks
# don't need the PKCS#12 file anymore
@lolzballs
lolzballs / HelloWorld.java
Created March 22, 2015 00:21
Hello World Enterprise Edition
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
public class HelloWorld{
private static HelloWorld instance;
public static void main(String[] args){
instantiateHelloWorldMainClassAndRun();
@staltz
staltz / introrx.md
Last active December 1, 2025 11:31
The introduction to Reactive Programming you've been missing
@thomseddon
thomseddon / gist:4703968
Last active September 9, 2024 04:24
Auto Expanding/Grow textarea directive for AngularJS
/**
* The MIT License (MIT)
*
* Copyright (c) 2013 Thom Seddon
* Copyright (c) 2010 Google
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell