Unix Operating System Tutorials

UNIX operating system articles, tutorials and resources
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This article will give people with no previous UNIX experience some sense of what UNIX is. This article will cover the history of UNIX and an introduction to UNIX. HISTORY OF UNIX AND CAUSES FOR ITS POPULARITY Most discussions of UNIX begin with the history of UNIX without explaining why...
Introduction Everyone of us might have come across a lot of text editors each of them having their own special features and style. GNU Emacs, apart from being a text editor, is a wonderful software which makes us believe it to be a mini operating system. Like other softwares, Emacs is...
APTonCD is a tool with a graphical interface which allows you to create one or more CDs or DVDs (you choose the type of media) with all of the packages you've downloaded via APT-GET or APTITUDE, creating a removable repository that you can use on other computers.One thing you need to remember this...
This is continuation of my previous article - Bash Simple Tricks Tutorial Again I am following a question – solution approach to demonstrate my scripts.. Scripts Write a script that displays the number of lines in a file that starts with a or A Script :-
This is continuation of my previous articles .. Please don't miss them :- Bash Simple Tricks Bash Simple Tricks (continuation) Again I am following a question – solution approach to demonstrate my scripts.. Scripts
In this tutorial of mine I am demonstrating some bash commands with some example scenarios/questions and their solutions.... What is Bash:- Bash or Bourne Again Shell is a reimplementation of Bourne shell... Bash is the default shell that comes with most of the linux distributions out...
As the title suggests it is continuation of Basics of CrackMe With Sample and Example. I assume a working knowledge of GDB and ASM as basics. In this article we'll be cracking a simple application that is more advanced to the previous one.. In this article I take the cracking a step further by...
Cron is a Unix/Linux etc .. utility thaat allows the tasks to be run at specific time as well as at specific intervals..The job that the program does are know as CronJobs and are stored in a table (Cron Table).. Using To schedule any task with cron we can use crontab command in Unix.. Lets...
Byte ordering in memory refers to the way in which the bytes corresponding to a certain value is stored in the memory. There are two ways in which bytes are stored in memory : Big endian Little endian Lets understand them one by one : Big endian
Normally web traffic (HTTP) is unencrypted i.e. it's passed around the network in plain text, so anyone with the right tools can view what's being transmitted. This is okay generally, but when we pass sensitive information like credit card information, passwords, nowadays even personal information...
du is an abbreviation for (Disk Usage), this command calculates & returns the size of entire directory tree as well as of individual files. df is an abbreviation for (Disk Free), it's job is to calculate and return the amount of free space of a disk/partition. These two commands report space...
SSH is a abbreviation for Secure Shell is a network protocol that allows data-exchange between devices on the network..This is mainly used in linux OS's to access shell accounts , shell commands etc... SSH was mainly designed as a replacement modification to telnet etc..other insecure remote shells...
GDB is GNU Project Debugger its basically is a debugger and allows you to see inside the program flow, control structure, working, code and we will see how we can do that. How to work with GDB We will we using a basic debugMe.c program throughout this tutorial helloworld.c ...
Introduction Many times we write programs which runs many instances of itself, either while using fork or we manually run many copies of the same program, so during the development stage we may need to kill all running instances and modify the program and re-run, or there may be other situations...
I have been using linux for 2 years now, and I can tell you that I learn something new virtually every day. And a few of those things I have learned are very rare to be seen all the time. Here are a few of them. If you are using Redhat's netcfg utility to connect to the internet and you are sick...
Concept: The UNIX kernel can keep track of many processes at once, dividing its time between the jobs submitted to it. Each process submitted to the kernel is given a unique process ID. Single-tasking operating systems, like DOS, or the Macintosh System, can only perform one job at a time. A...
Most sys admins know the importance of keeping an action log where various tasks, configuration changes, etc. are kept. Simple logs indicating, "I did this" or "John did that" may be sufficient in some organizations, but for some, full transcripts of changes made are desired. Doing a copy-and-paste...
There are times, when sitting on your Linux box, working on a command line terminal, you suddenly feel a need of copying a file to/from a remote host. At this point you desire a command line utility that could do this task for you in just one line. Well, this is where 'scp' saves your day :-) ...
Shell Tips & Tricks Create A Command Alias Most of us use 'ls -l' so, will it not be easier to have a smaller command to show us long listing, add the following line to ~/.bashrc alias ll='ls -l' Using it # ll
Part I - Shell Tips & Tricks Clear and Disable Bash History Use the Bash inbuilt history command: history -cTo prevent writing of your Bash history to the history when you log out: unset HISTFILEAmpersand (Background Jobs)