Category Archives: BASH

VMWare Workstation start on boot CentOS

Centos EPEL – Howto add EPEL repository to your Centos 6.x

Centos EPEL

Centos EPEL – In the following tutorial I will show you how to add the fedora EPEL repository to your CentOS installation

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Applicable to

  • Centos 6.x

 

Requirements

In order to install CentOS EPEL Repository you need:

  • root access
  • wget:
    yum install wget

 

Installation

check here for latest version of epel-release-x-x.noarch.rpm

wget http://mirrors.nl.eu.kernel.org/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uvh epel-release-6-8.noarch.rpm
rm epel-release-6-8.noarch.rpm -f

or in short:

rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

 

That’s it! You’ve added CentOS EPEL repository to your centos installation.

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Beginners Guide to Git / GitHub with Windows

 

Introduction

“Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

Git is easy to learn and has a tiny footprint with lightning fast performance. It outclasses SCM tools like Subversion, CVS, Perforce, and ClearCase with features like cheap local branching, convenientstaging areas, and multiple workflows.”  http://git-scm.com/

If you don’t already know what Git is, take a crash course.  Git (Wikipedia)

 

Installing Git

Download Git

There’re many Git clients available for windows, like GitmsysgitQGitGitColaTortoiseGitSmartGit  (FREE and Commercial) and others. not to mention existing eclipsevisual studio extensions. You may choose what’s suits you best.

I’ll demonstrate using the GitHub for Windows GUI. Download it Here.

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[dl url="http://git-scm.com/download/win" title="GitHub for Windows GUI" desc="GitHub for Windows GUI"]

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Install Git

Those instructions are for version 1.8.0-preview20121022. your installation may be different.

Installation is fairly simple, Just press <NEXT> 6 times to the end (don’t forget to READ the GNU General Public License!). the default options are ok for any starter.

 

If you know what you are doing, read each step carefully, if you need to add the Git or Unix tools from the windows command line, you should enable it during the installation. i recommend Git Bash only, Windows command Prompt (second option) ok too. should be safe, I find it rather useless. the third option is only for experts. do it on your own risk!

 

By default the Git Setup uses OpenSSH bundled. If you are using Putty, you can enable the Tortoise PLink at the setup wizard.

 

I recommend leave the default line ending windows style.

 

 

Using Git

Start a repository (git init)

If the Repository meaning is unknown to you, read this.

For Start your will create your own local repository.

You need an empty folder to create your repository in. create a <New Folder> folder on your desktop, drive d, or anywhere you want, as long as you remember where.

 

 

Now, Like almost anything in git, start the new repository (git init) can be done in several ways:

Git Context Menus

Maybe, the simpleist way, is the context menus. select or create a new empty (or not) folder anywhere, right click it and then select <Git Init Here> (It may be under X64 menu in x64 systems).

 

Git Gui

Start your Git Gui > Create New Repository > Browse (Select your empty folder) > Create.

Git Bash

It may not suited for anybody, but: right click a folder > git Bash

git init

or start Git Bash from your start menu and then use cd to find your folder, for example:

cd /D/Projects/c++/New Folder
git init

 

Command Prompt

If you have installed the command prompt you can use windows command prompt to locate the folder and then <git init> the same you whould do in git bash.

 

Result

Any way you’ve choosed, will create an hidden <.git> folder inside your folder which saves all the data for your repository. you can delete the .git folder to delete your local repository and disband anything you made using git and your folder returned to be an normal empty folder.

 

 

Repository Status

You can check your repository status:

Git Gui

if you are just created your new repository, you are in the status screen. Just press to Rescan button to update.

 

You can load Git Gui anytime > Open Existing Repository > Browse for your folder.

 

 

 

Context Menus

another easy option is to right click the folder on your file browser and then select the <Git Gui> context menu and read the above.

 

Git Bash

you can now use the

git status

from Git Bash or command prompt  anytime to view your local git status (you need to be inside the project folder for this command to work)

 

Add Files To Repository

Your repository saves the folder versions as commits. before you can commit each commit, you need to add the files you want to be in this commit. if your folder is still empty, you can create now a file or two. just for practice.

maybe it’s a good time to create your README.MD file.

 

 

Identify yourself

The first thing to do before you can commit is to identify yourself so Git will know what name to sign on your commits. You can change it anytime but commits you’ve made with this sign will stay. if you won’t configure it, you will get an error later when you’ll try to commit.

Identify yourself can be done only by using the Git Bash or command prompt:

git config --global user.email "you@example.com"
git config --global user.name "Your Name"

Omit –global to set the identify only in this repository.

 

Add files to repo and commit

Context Menus

The context menus have only one option when you right click the folder or anyfile inside it – <Git add all file now>. It will check all the files inside the folder as belong to the local repository and will add(flag) them as to be saved in the next commit.

This feature won’t suit in most cases as it set all files and won’t let you leave files as not belong to the repo – which is commonly done.

Git Gui

Took me time to find this, click on the icons of the files in the Unstaged Changes area to add them to current commit. you can also click the Stage Changed button  to add them all.

click on the file icon again on the Stage Changed area to remove the file from this commit.

After you’ve selected the files (and directories) to be in the commit, Insert an Initial Commit Message and Press the Commit button to commit :).

 

Git Bash

Beside the social benefits of git, local repository helps you track versions of your files. compare them, and restore older version if needed. when git init command creating the .git folder in the first time, it doesn’t track no file. to add files for track you need to use the

git add <filename>

for example you can create an empty (or not) file called README.MD and type:

git add README.MD

you can use wildcard (such as git add *.conf). this way you can add files to the current commit, and when you ready type:

git commit -a

you need to provide a commit description. using vim by default (can be changed), and you updated your repository with you first commit.

 

Result

Inside your hidden <.git> folder, git has saved a copy of all your (selected) files inside this repository. this called a commit. now you can continue edit your files, knowing you can always go back to this point again.

 

 

 

Clone a repository

If you want to get a copy of an existing Git repository — for example, your github hosted project or other project you’d like to clone local or contribute to — the command you need is 

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git clone

. the following example will cover this topic clearly.

REMEMBER: to change drive inside git-bash use the CD /D/FOLDER syntax.
git clone https://github.com/WordPress/WordPress

gitclone

this line will create a folder inside wherever folder you are located in called WordPress and clone (copy) to it all the files from wordpress repository. you will see inside a .git folder also, which mean you can continue now with your local repository, and even update the source if you have the permission to do so.

to update your local version with the server later:

git pull

you can also use the Git Gui to clone existing repository, just supply the source location and the target directory.

 

 

 

 

Use GitHub

After everything installed and configured, I’ll demonstrate using the above functions to connect to GitHub repository. I’ll demonstrate only using Git-Bash, but feel free to use the other methods as you like.

 

Create repository

First step is to create your repository at Gitghub. if you haven’t yet read the following:

Create A Repo – goto New Repository page in github and create your new repo. this tutorial is for public & free repo.

you can set a README.MD file to be clone ready immediatly. the following is for a new repo without README.MD:

after you created a new repository you need to git it to a folder.

 

Connect to Github

Git Bash

follow inside new directory:

  1. git init your empty directory.
  2. create a README.MD file or any other file.
touch README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/<your-user-name>/<project-name>.git
git push -u origin master
After the last command (git push) you will be requested to insert your Github username and password. everytime.

To disable username & password request each time, you need to use ssh authentication, which is behind the scope of this article.

 

Existing Source

if you already have a project your want to create the repo from just go inside your folder, git init it like above, git add neccesary files (you can use wildcard!) and then resyne the last three line above.

Existing Repo

if you have a local repo which you want to link to your new online repo just use the last two lines of the bash code above.

 

* more info: Create A Repo tutorial on github

 

Push/Pull from/to repository

to push your updates to the server:

git push

to update your local version with the server is the same:

git pull

 

Reset Changes from last commit

to reset all the changes you made from the last commit just use:

git reset --hard

 

Check Difference from last commit

to see the changes made in your git from the last commit use:

git diff

‘Q’ for exit. 😉

 

 

Those are the basics of Git. you can do a lot more with version control and collaborate with others.

Happy Git-ing…

 

 

Development Specialist, Artist and Activist
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SSH connection without password between two linux machines

Overview

How to establish SSH connection without password between two linux/unix machines

SSH connection without password between two linux machines

Instructions

  1. Generate the files: [id_rsa], [id_rsa.pub] in the First Machine by typing at command (do not use a password – just hit Enter*) :
    ssh-keygen


    * You don’t want to enter any passwords, because you want to call ssh from a within a shell script.
    ** The randomart is an easier way for humans to validate keys.
  2. Copy (and rename) id_rsa.pub to authorized_keys on Server (run from the same computer you run ssh-keygen);
    scp -r -P 22 /root/.ssh/id_rsa.pub destination:/root/.ssh/authorized_keys
     

    Where destination is server B.

Now you can connect as root without a password between the servers.

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How to Set-Up Git / GitHub on Centos 6.3

Git

 

Introduction

“Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

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Installing Lighttpd on Centos 6.3 is Easy!

Overview

Security, speed, compliance, and flexibility — all of these describe lighttpd (pronounced lighty) which is rapidly redefining efficiency of a webserver; as it is designed and optimized for high performance environments.
With a small memory footprint compared to other web-servers, effective management of the cpu-load, and advanced feature set (FastCGI, SCGI, Auth, Output-Compression, URL-Rewriting and many more) it is the perfect solution for every server that is suffering load problems.And best of all it’s Open Source licensed under the revised BSD license.

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Installing Python / Django on Centos 6.3 is Easy!

 

 

Django

NOTE: This article was rewritten (for CentOS 6.4). please read the updated post.

What is Python?

Python is a general-purpose, high-level programming language whose design philosophy emphasizes code readability. Its syntax is said to be clear and expressive.” from Wikipedia.

Visit http://www.python.org/

 

What is Django?

“Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.” from https://www.djangoproject.com/

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Install VirtualBox Guest Additions on Centos Minimal 6.3

Prerequisities

if you have installed new setup of centos minimal or you haven’t installed yet, you need make, gcc, kernel-devel in order to Install VirtualBox Guest Additions installation script.

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Do something GOOD! with your PC – BOINC on RHEL/Fedora/Centos!

boinc

Boinc

BOINC is an open-source software platform for computing using volunteered resources, Use the idle time on your computer (Windows, Mac, or Linux) to cure diseases, study global warming, discover pulsars, and do many other types of scientific research.

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