UNIX

Install LibreOffice on CentOS

by

1. Download LibreOffice Linux Package LibreOffice  64-bit version wget http://download.documentfoundation.org/libreoffice/stable/6.1.3/rpm/x86_64/LibreOffice_6.1.3_Linux_x86-64_rpm.tar.gz LibreOffice  32-bit version wget http://download.documentfoundation.org/libreoffice/stable/6.1.3/rpm/x86/LibreOffice_6.1.3_Linux_x86_rpm.tar.gz 2. Change to root User su – ## OR ## sudo -i 3. Extract LibreOffice Package and Access Directory LibreOffice tar -xvf LibreOffice_* cd LibreOffice_* LibreOffice tar -xvf LibreOffice_* cd LibreOffice_*   4. Install / Update LibreOffice RPM packages Install … Read more

shell embedding and options

by

shell embedding Shells can be embedded on the command line, or in other words, the command line scan can spawn new processes containing a fork of the current shell. You can use variables to prove that new shells are created. In the screenshot below, the variable $var1 only exists in the (temporary) sub shell. You … Read more

shell variables

by

In this post we learn to manage environment variables in the shell. These variables are often needed by applications. $ dollar sign Another important character interpreted by the shell is the dollar sign $. The shell will look for an environment variable named like the string following the dollar sign and replace it with the … Read more

control operators

by

In this post we put more than one command on the command line using control operators. We also briefly discuss related parameters ($?) and similar special characters(&). ; semicolon You can put two or more commands on the same line separated by a semicolon ; . The shell will scan the line until it reaches … Read more

commands and arguments(shell expansion)

by

arguments One of the primary features of a shell is to perform a command line scan. When you enter a command at the shell’s command prompt and press the enter key, then the shell will start scanning that line, cutting it up in arguments. While scanning the line, the shell may make many changes to … Read more

the Linux file tree

by

This post takes a look at the most common directories in the Linux file tree. It also shows that on Unix everything is a file. filesystem hierarchy standard Many Linux distributions partially follow the Filesystem Hierarchy Standard. The FHS may help make more Unix/Linux file system trees conform better in the future. The FHS is … Read more

working with linux directories

by

This module is a brief overview of the most common commands to work with directories: pwd, cd, ls, mkdir and rmdir. These commands are available on any Linux (or Unix) system. pwd The you are here sign can be displayed with the pwd command (Print Working Directory). Go ahead, try it: Open a command line … Read more

LINUX LICENSING

by

This post briefly explains the different licenses used for distributing operating systems software. about software licenses There are two predominant software paradigms: Free and Open Source Software (FOSS) and proprietary software. The criteria for differentiation between these two approaches is based on control over the software. With proprietary software, control tends to lie more with … Read more

VULNERABILITY ASSESSMENTS

by

THE CHALLENGES OF VULNERABILITY ASSESSMENTS Network vulnerability assessments are widely recognized as a crucial component of network security and a key component of any overall Network Security Assessment Service. Vulnerability Assessments are performed to determine the actual security posture of a network environment. They are designed to explore whether or not a malicious attacker can … Read more