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First Linux Script

In this first script I will show you all the details and preparations that you will need to do prior creating an running your first Linux script. I will use VIM text editor (see the tutorial in the link), but you can use any editor that you might like.

Go to the folder in which you want to create the file for the script and type:

vim test.sh

The editor will create a new file…

Permissions in Linux: Octal mode

Octal/Absolute mode Permissions

Are specified by adding them in numeric/digit mode, as they are kept in file’s inode. This way previous permission settings are lost and overwritten by the new ones.

Permissions of a file are stored in inode as bits, and they form a construct of 12 bits as follows:

(3 groups * 3 basic permissions) + 3 special permissions = 12 bits in total

Let’s say we have a file…

Git Commands List

Installation: sudo apt install git – installs GIT from repositories;

Configuration: git config –global user.name “Your Name” – the name that will be added to commits and tags; git config –global user.email “[email protected]” – the e-mail address that will be added to commits and tags; git config –global color.ui auto – enables the colors in GIT output;

Starting: git init [project…

Using GIT in Linux

How to use GIT in Linux

GIT is a revision control system that allows multiple contributors to work on same projects/files. Is also useful if you have more servers/vms/workstation that you manage and you want to deploy “recipes”/scripts/configurations on them. With GIT, you work locally, push the changes to the repository server and then get your files from any location you want. GIT tracks the…

How to install Steam on Linux

How to install Steam on CentOS

In order to install Steam on CentOS you must follow the steps provided below:

-Open Terminal Window:

-Enter in root mode, type: sudo bash, input root password and press ENTER;

-Type: yum install epel-release yum -y updated

-Navigate to /etc/yum.repos.d/ : cd /etc/yum.repos.d

-Create a new repo file using VIM: vim steam_new.repo

-Paste the text below in the new file…

Each Linux/Unix command has 3 communication channels: input, output and error. The output can be filtered and then redirected and by this way parts of it can be captured, depending on the needs.

Redirecting the output to a file, using > or >>:

if the file mentioned does not exist it will be created, and if it does exist it will be overwritten;

ls -la > testfile1.txt

> – if the file mentioned…

Metacharacters

We often want to refer to a group of files or directories that have a common characteristic. To do this, there are some small constructs which helps the user to filter the needed files. For example if in a folder we have a lot of jpg, mp3 and doc files and we would like to list only the doc files, in order to do this we will have to filter the files:

The command is: ls -l *.doc

But…

Here is a list that contains one of the most used Linux commands, and a short explanation for them:

ls – list – lists files and directories, can be used with a lot of options like: -a, -R, -l, -g, -r;

pwd – print working directory – shows the path of the current directory;

ifconfig – interface configuration – used to view and change the configuration of the network;

cd – change directory – used…

E3 2017 is here!

Don’t miss E3 2017, everything will be starting on June 13, 2017 at the Los Angeles Convention Center. Biggest players in IT world, like Ubisoft, Electronic Arts, Microsoft, Nintendo, Sony and Bethesda , will be there to offer interviews, live streams, press conferences, announcements and more. Here you can find the full list of exhibitors.

At this moment it’s unclear what new games will be…

Linux Directory Map / Structure

Root   Path  Description bin/ ( -> usr/bin) Files that can be executed (binary files) used to troubleshot or debug the operating system. boot/ Contains a minimum number of files needed by the operating system to boot – a part of bootloader, bootmanager and the kernel dev/ Contains file representations of peripheral devices and pseudo-devices. etc/ System…

Directories and their role

As you already know, in Windows just after the install there are a few standard directories like: Windows, Program Files, Documents and Settings/Users. In Linux a similar structure exists but with much more directories. I will present you below the most important ones:

/home = contains user’s personal folders and files

/root = contains the files and folders of root user

/dev = special files for…

Using help in Linux

Before you start this tutorial is better to know how to get help and details about the commands, when you need it. There are several ways to get help about the commands, but I will present only the most important ones:

Using –help as argument for the command

Example: cp –help

Using man as a pre-argument for the command

Example: man cp

Using info as a pre-argument for the command

Example: info cp

Linux Beginner’s Guide Part 6

Network Configuration

The ifconfig command is used to view the current network configuration for ethernet cards and iwconfig displays the network configuration for wireless cards.

ifconfig [OPTIONS]

iwconfig [OPTIONS]

Because this is the output from a Virtual Machine the ethernet is called enp0s3, on hardware machines is eth0.

The lo (loopback) interface is a software device used by the…