Traditional creation of programs This is also called static linking The old way of creating programs was by writing multiple source files (text files with program code), then translating each one (called compile), thus creating object files. The, link these files to create an executable file, that can be run: Dynamic …

Read More

What is a process A process is an instance of an executing program. A program is a file containing a range of information that describes how to construct a process at run time: Machine-language instructions: These encode the algorithm of the program. Data: The program file contains values used to initialize variables …

Read More

Linux Basics linux introduction Running in VirtualBox trying out commands command types Linux Files file basics file permissions devices & mount hard & soft links Processes processes basics system calls shared libraries Various vi editor systemd systemd basics systemd units systemd example

Read More

About the linux directory tree Linux has a single directory tree, starting with the root directory Othe oerating systems use different methods to refer to the same information. Microsoft Windows for example, uses a single tree for each device. It uses letters to refer to thise devices. eg: a:\mydir\myfile.txt is a file …

Read More

inodes The inode (index node) is a data structure in a Unix-style file system that describes a file-system object such as a file or a directory. Each inode stores the attributes and disk block locations of the object's data Since each file has a single inode, the inode number can be thought of the "physical …

Read More

About Permissions Here's a long listing of a file I've created with the touch command: 1-rw-rw-r-- 1 osboxes osboxes 0 Jan 7 07:30 myfile This is the explanation to the first field you see: Where: r means read w means write x means execute The numbers specify the values in binary converted to octal, so you can specify …

Read More

Use this post as a guide, to learn basic file commands. List Files Use ls to just list file: 1ls Use long listing (ls -l) to do the same. List a specific file (let's say you have a file called "mydata"): 1ls mydata Long list that file: 1ls -l mydata List a directory that is not the current directory: 1ls /tmp …

Read More

Command Types Try the following commands: 1type -a ls 2which ls The bash type builtin shell command can show you what is the type of the parameter you give it. The -a parameter asks for ALL available types. Linux has several command types(e.g ‘alias’, ‘function’, ‘builtin’, ‘file’, ‘keyword’) We'll focus on: file shell …

Read More

Opening a terminal Use the start button at the bottom left to show pre-installed applications. Then run the Terminal application Inside this window, you are actually running the famous linux-shell, in this case bash. Most of the time, linux user type text commands in a shell like this. let't try this out. Running …

Read More

Infrastructure I use this infrastructure throughout my training material. I run multiple versions, and cannot "get rid of" my Windows (I don't hate Windows that much :) so using virtualization was a practical solution. first, install VirtualBox from this location. (I am currently using is 7.0.12 r159484) …

Read More