DEV Community: Şammas Çölkesen

Useful Java KeyStore Keytool Commands

Şammas Çölkesen — Sat, 09 Jan 2021 09:58:09 +0000

Create Self-Signed Sertifika and KeyStore

>keytool -genkey -keyalg RSA -alias selfsigned -keystore keystore.jks -storepass password -validity 720

Create CSR Certificate

>keytool -certreq -alias mydomain -keystore keystore.jks -storepass password -file mydomain.csr

Delete Certificate from KeyStore

>keytool -delete -alias mydomain -keystore keystore.jks -storepass password

Add Signed Primary Certificate to KeyStore

>keytool -import -trustcacerts -alias mydomain -file mycrt.crt -keystore keystore.jks

Change KeyStore Password

>keytool -storepasswd -new new_storepass -keystore keystore.jks

List KeyStore

>/JAVA_HOME/jre/bin/keytool -list -keystore KeyStore -storepass password

Create Private Key

>keytool -genkey -alias KeyToolAlias -keystore privateKey.store

# Enter keystore password:
>1234

# What is your first and last name?
>John Smith
# What is the name of your organizational unit?
>Sowtware Development
# What is the name of your organization?
>dev.to
# What is the name of your City or Locality?
>Istanbul
# What is the name of your State or Province?
>Besiktas
# What is the two-letter country code for this unit?
>TR
# Is your infos correct?
>yes

How I hacked Medium (Not about cybersecurity)

Şammas Çölkesen — Thu, 30 Jan 2020 10:24:51 +0000

Hi

I don't use Medium in my daily life. But sometimes curious links get you there.When you click that link something bad happens.

So if you wanna read that article you should pay to medium or clear your browser cookies.

But I found something more useful.And that is Pocket App

Create a free account on Pocket.And Save the article to pocket.That's it.Simple.And you can read medium article both browsers and pocket app without adds and other distractive components. Also you can listen those articles.So simple and efficent.

Check IP with Regex in Java

Şammas Çölkesen — Fri, 29 Nov 2019 11:31:04 +0000

Let's check ip addresses in Java with regex

First of all we need to import 2 library.

import java.util.regex.Matcher;
import java.util.regex.Pattern;

Now, lets define ip regex


      public static final String IP_REGEX ="^"
            + "([01]?\\d\\d?|2[0-4]\\d|22[0-3])\\."
            + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
            + "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
            + "([01]?\\d\\d?|2[0-4]\\d|25[0-4])$";

^ -->start of the line

( --> start of group #1

[01]?\d\d? --> Can be one or two digits. If three digits appear, it must start either 0 or 1
# e.g ([0-9], [0-9][0-9],[0-1][0-9][0-9])

| --> or

2[0-4]\d # start with 2, follow by 0-4 and end with any digit (2[0-4][0-9])

| --> or

25[0-5] # start with 2, follow by 5 and ends with 0-5 (25[0-5])

) --> end of group #2

. --> follow by a dot "."

.... --> repeat with 3 times (3x)

$ -->end of the line

Create an pattern object and pass regex string to it.


                String ipregex = System.console().readLine(); //read input

                Pattern ipPattern= Pattern.compile(IP_REGEX); 
                Matcher ipMatcher = ipPattern.matcher(ipregex);

Finally we can control our result.

        //Control flow
        if (!ipMatcher.matches()) { 
                     System.out.println("Yay ! ");
                     }
                else{
                    System.out.println("Noooooo! ");
                }


            return ipregex;

This is my linux environment.

Şammas Çölkesen — Sat, 10 Aug 2019 09:36:01 +0000

Hi , I used different Linux Distros such as Fedora,Ubuntu,Kali,Parrot-Sec and Pardus. And these are the tools that i love to use .

Desktop Environment

MATE

Icon Pack

Paper

Theme

Arc-Dark

Wallpaper

Generally i use this site to find cool backgrounds.

Unsplash

Browser

Firefox

Packet Manager

SNAP

Terminal

Tilix

Version Control

Git

Python Development

PyCharm

Anaconda

Jupyter Notebook

Java Development

Intellij Idea

Eclipse

Android Development

Android Studio

Web Development

VS Code

Database

Dbeaver

mongoDB

MySQL

API

Postman

Cloud

Dropbox

Virtual Env

VMware Player

Office

LibreOffice

Music

Spotify

Video

mpv

kaffaine

Graphic

Krita

Screen Recorder

simplescreenrecorder

Communication

Skype

Torrent

qbittorent

Productivity

So, what are your tools ?

Git Tuturial For Beginners

Şammas Çölkesen — Fri, 09 Aug 2019 11:25:47 +0000

Git Tutorial

User Settings

for usage manuel

#git help

config our username and email

#git config --global user.name "sammas"
#git config --global user.email "sammas@gmail.com"

show everything configs

#git config --list

Create

create repo

#cd path_folder 
#git init

clone a repo

#git clone repo_url

Local Changes

view working status

#git status

track changed files

#git diff

add a file to next commit

#git add -p <filename>

commit all files

#git add .
this means take snapshots of all things and maybe you later fuck things up and takes it back.

commit message

#git commits -m "this is commit message"

change the last commit

#git commit --amend
dont do it to pushed commits

Search for commits that include a keyword

#git log -S"config.menu_items"

Local History

view logs

#git log
#git log --author="sammas"
#git log -p file

show stats

#git log --stat

Print out visualization of your log

#git log --pretty=oneline --graph --decorate --all

look at who and what changed in file

#git blame file

show pathces

#git log -p

Branches

list branches

#git branch -av

switch HEAD branch

#git checkout <branch>

create a new branch based on your current HEAD

#git branch <newBranch>

delete local branch

#git branch -d <branch>

mark the commit

#git tag <tagName>

create branch from remote branch

#git checkout --track <remoteBranch>

Publish

Pushing to a GitHub Repository

#git remote add project_name https://github.com/user/repo.git 
#git push -u project_name branch(master vs)

Commit Directly to the Repository

#git commit -am "message"

list all configured remotes

#git remote -v

show info about remote

#git remote show <remotename>

download all changes from remote but dont integrate into HEAD

#git fetch <remote>

download all changes from remote and merge to HEAD

#git pull <remote> <branch>

publish your tags

#git push --tags

Merge

merge branch into your current HEAD

#git merge <branch>

rebase your current HEAD onto branch

#git rebase <branch>

abort rebase

#git  rebase --abort

Undo

delet all local changes

#git reset --hard HEAD

delete one file changes

#git checkout HEAD <file>

reset your HEAD to previous commit

#git reset --hard <commit>

preserve all changes as unstaged changes
#git reset <commit>

and preserve uncommitted local changes
#git reset --keep <commit>

delete files

#git rm file

rename files

#git mv msg.txt mesaj.txt

moving files

#git mv msg.txt home\sammas\msg.txt

Getting Old Versions from the Repository

#git log
#git checkout 0128dba..... -- index.html

Create Alias

alias gitA="git add -A ."
alias gitC="git commit -m"
alias gitP="git push"

List all git aliases

#git config -l | grep alias | sed 's/^alias\.//g'

Git Notes

Add or inspect object notes

list notes about object

git notes [list [<object>]]

Add notes for a given object (defaults to HEAD)

git notes add [-f] [--allow-empty] [-F <file> | -m <msg> | (-c | -C) <object>] [<object>]

Copy the notes for the first object onto the second object.

git notes copy [-f] ( --stdin | <from-object> <to-object> )

Append to the notes of an existing object (defaults to HEAD). Creates a new notes object if needed.

git notes append [--allow-empty] [-F <file> | -m <msg> | (-c | -C) <object>] [<object>]

Edit the notes for a given object (defaults to HEAD).

git notes edit [--allow-empty] [<object>]

Show the notes for a given object (defaults to HEAD).

git notes show [<object>]

Merge the given notes ref into the current notes ref

git notes merge [-v | -q] [-s <strategy> ] <notes-ref>

Remove the notes for given objects (defaults to HEAD)

git notes remove [--ignore-missing] [--stdin] [<object>…]

Remove all notes for non-existing/unreachable objects.

git notes prune [-n] [-v]

Print the current notes ref.

git notes get-ref