• Download YouTube Videos in Linux

    Do you want to Download your favorite you tube video in Linux? No problem! Here I have mentioned all steps to download you tube video using Linux Terminal.   Step 1: Install youtube-dl package by executing, On Ubuntu, $ sudo apt-get install youtube-dl On Fedora, RedHat, CentOS, # yum install youtube-dl -y Step 2: After having successfully installed youtube-dl, open a...
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  • Relay Emails using Gmail Account (Shell Prompt)

    If you are using Linux Desktop Operating System and do not want to set up an email server, use GMail account to relay emails. On Desktop OS, we can use GUI Email Clients, which supports POP3/IMAP to send an email but how about /usr/bin/mail or from cmd prompt? To fulfil your requirement, you need to install a simple program called ssmtp. It accepts a mail stream on standard input...
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  • Ubuntu – Change Network Card MAC Address

    MAC stands for Media Access Control and in a sense the MAC address is a computer's true name on a LAN. An Ethernet MAC address is a six byte number, usually expressed as a twelve digit hexadecimal number. To change this setting, we’ll need to edit the /etc/network/interfaces file. You can choose to use a different editor if you’d like. $ sudo gedit /etc/network/interfaces You s...
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  • Start multiple instances of MySQL on the same machine

    There are various methods to run multiple instances of mysql (on different ports) on the same machine. Here I have used the same binary and used a separate configuration file (with separate port, pid, socket and data directory). We need to create new directories for our datadir and log folder (if used). Also we need to assign proper permissions on those folders: # mkdir /var/lib/mysql2 # chown -R mysql.mysql...
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  • YUM – Exclude Package Update

    YUM is an interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on "repository" metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services (see below). yum is similar to other high level package ...
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  • eAccelerator Configuration With PHP5

    eAccelerator is a free open-source PHP accelerator, optimizer, and dynamic content cache. It increases the performance of PHP scripts by caching them in their compiled state, so that the overhead of compiling is almost completely eliminated. It also optimizes scripts to speed up their execution. eAccelerator typically reduces server load and increases the speed of your PHP code by 1-10 times. I have tested this...
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  • LAMP on Linux Server

    You may have heard of a server system called LAMP, and wondered what it is. Well, the answer is that LAMP isn't any one thing on its own - it's actually a combination of four technologies. Together, the LAMP technologies form the most popular overall server system on the web today. LAMP is short for Linux, Apache, MySQL, PHP. This will guide you to install LAMP server on your Linux System. Note: I...
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  • How to Create RPM?

     In RedHat/CentOS/Fedora, software are packaged in .rpm format. rpm is a powerful Package Manager, which can be used to build, install, query, verify, update, and erase individual software packages. A package consists of an archive of files and meta-data used to install and erase the archive files. The meta-data includes helper scripts, file attributes, and descriptive information about the package. Packages...
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  • Recover MySQL root Password

    Do you lost or forgot mysql root password ? No problem...! You can recover MySQL database server password with following steps. First Stop mysql service. # /etc/init.d/mysqld stop Start MySQL server without password: # mysqld_safe   - -skip-grant-tables & Connect to mysql server using mysql client: # mysql -u root Setup new MySQL root user password mysql> use mysql; mysql> update user set p...
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  • Disable Interactive Startup in Linux

    Fedora, CentOS and RHEL allow the console user to perform an interactive system start-up by pressing [I] key. Using interactive boot, attacker can disable the security services and may get access to system. Open etc/sysconfig/init file and disable PROMPT option, # vim /etc/sysconfig/init PROMPT=no Now restart the system and...
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  • Dropbox

    Dropbox is a Web-based file hosting service operated by Dropbox, Inc. which uses cloud computing to enable users to store and share files and folders with others across the Internet using file synchronization. It was founded in 2007 by MIT graduates Drew Houston and Arash Ferdowsi as a Y Combinator startup says Wikipedia.   To install DropBox on your system, download appropriate rpm for your...
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  • Linux Kernel Performance and Tuning with vm.swappiness

    vm.swappiness is a tunable kernel parameter that controls how much the kernel favors swap over RAM. At the source code level, it’s also defined as the tendency to steal mapped memory. A high swappiness value means that the kernel will be more apt to unmap mapped pages. A low swappiness value means the opposite, the kernel will be less apt to unmap mapped pages. In other words, the higher the v...
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  • Nikto - Web Server Scanner

    Nikto is a web server scanner tool, which performs comprehensive checking against web servers for multiple items, including over 3500 potentially dangerous files/CGIs, versions on over 700 servers, and version specific problems more than 200 servers. Nikto is built on LibWhisker and can run on any platform which has a Perl environment, and supports SSL, proxies, host authentication, IDS...
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  • Mozilla Firefox Installation on Fedora Linux

    Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. As of October 2010, Firefox is the second most widely used browser, with 30% of worldwide usage share of web browsers. In Germany, Firefox is the most popular browser with 60% usage says Wikipedia. To install Firefox 4 on Fedora Linux, # vim ...
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  • Convert DEB to RPM or RPM to DEB Package

    You can convert DEB file to RPM package and RPM to DEB package using alien command, if you have a *.rpm file that you want to install on a Debian or Ubuntu. Convert RPM to DEB Install alien command on Ubuntu as mentioned here: # sudo apt-get install alien Now, use alien command to convert rpm to deb file, # alien...
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  • Linux Filesystem IO benchmarking tool - Fileop

    Fileop utility does file operation on the filesystem and gives the ops/sec for each operation. This tool will be useful to test your filesystem performance as well as storage performance. Or, if you are going to select a filesystem or storage that is going to host huge number of small files (like source codes), then fileop can be used for benchmarking. First Install  ...
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  • Linux Swap Space Configuration ( Using File )

    Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it should not be considered a replacement for more RAM. Swap space is located on hard drives, which have a slower access time than physical...
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  • Set MySQL Root Password

    For mysql, the system administrator user is called root. We will use the mysqladmin utility from a command line to set the new password. Default password is not secured at all. By default in RedHat, Fedora and Centos default password is null. So it is always better to set root password. To set root password, # mysqladmin -u root password XyZ@aBc@123 # mysqladmin -u root -h ...
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  • SQUID - Timezone Modifications

    Squid is a proxy server and web cache daemon. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic.  Once after you have configured Squid, you may notice at the bottom of error page signature appears with GMT timezone. You might...
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  • GRUB Password Setting in Linux

    When your system is rebooted, grub presents the boot option menu called splace screen. From here, you or anybody can easily login into a single user mode (sometimes it is called Rescue Mode) without the password which might result into breaching computer security. You can set a password for the GRUB boot loader. This prevents users from rescue or Singe-User  mode or changing settings at boot ...
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  • Windows Fonts in Linux

    Do you want to create a document using windows fonts in Linux? No problem, please install windows fonts using one of mentioned method. Method 1: Copy the *.ttf (True Type Fonts) fonts like Arial, Tahoma, Verdana, Courier New and Times New Roman from the windows partition to the fonts:// location in nautilus. Method 2: For Ubuntu users, and since Ubuntu does not have a...
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  • Back Up files by sending it to Gmail

    Nowadays, GMail servers are very much reliable and give you a couple of GiBs for free of cost! So, it is the best place to store your linux system's important data. In order to accomplish this, first create a directory named “backup” in the root directory of your system: # cd / && mkdir backup Now, you need to create a script, which will perform backup and mail it for you...
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  • MemCache Installation On Linux

    “MemCached” is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.  Activate the RPMForge repository, #wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm # rpm -ivh rpmforge-release-0.5.2-2.el5.rf.i386.rpm Now install memcache rpm from rpm...
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  • Test Memory Using memtester in Linux

    memtester is a user-space utility for testing the memory subsystem in a computer to determine if it is faulty. It does a good job of finding intermittent faults and non-deterministic faults. It has many tests to help catch borderline memory. memtester should compile and run on any 32- or 64-bit Unix or Unix-like system. Download latest version of memtester from...
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  • SARG

    SARG – Squid Analysis Report Generator Configuration is a tool that allow you to view “where” your users are going to on the Internet. SARG provides many information about Squid users activities like, times, bytes, sites, etc… Download latest version of SARG from here. # wget http://...
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update-perl-sax-parsers

Nov 22nd

Posted by Dhaval Soni in Section 8

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SYNOPSIS update-perl-sax-parsers [options] –add parser_module update-perl-sax-parsers [options] –remove parser_module update-perl-sax-parsers [options] –update DESCRIPTION update-perl-sax-parsers inserts, updates and removes individual Perl SAX parser module info files in the directory /var/lib/libxml-sax- perl/ParserDetails.d and the overall Perl SAX parser modules info file /etc/perl/XML/SAX/ParserDetails.ini. OPTIONS –add Adds the per-module info file for the indicated Perl SAX parser module to…

gnome-options

Nov 22nd

Posted by Dhaval Soni in Section 7

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SYNOPSIS program [standard options] [specific options] arguments DESCRIPTION This manual page describes the command line options, which are common to all Gnome applications. OPTIONS Help options -?, –help Show the application’s help message. –usage Display a brief usage message. –version Show the application’s version information. Bonobo Activation support –oaf-ior-fd=FD File descriptor to print IOR on…

glob

Nov 22nd

Posted by Dhaval Soni in Section 7

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DESCRIPTION Long ago, in Unix V6, there was a program /etc/glob that would expand wildcard patterns. Soon afterwards this became a shell built-in. These days there is also a library routine glob(3) that will perform this function for a user program. The rules are as follows (POSIX.2, 3.13). Wildcard Matching A string is a wildcard…

update-pciids

Nov 22nd

Posted by Dhaval Soni in Section 8

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SYNOPSIS update-pciids [-q] DESCRIPTION update-pciids fetches the current version of the pci.ids file from the primary distribution site and installs it. This utility requires curl, wget or lynx to be installed. If gzip or bzip2 are available, it automatically downloads the compressed version of the list. OPTIONS -q Be quiet and do not report anything…

update-passwd

Nov 22nd

Posted by Dhaval Soni in Section 8

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SYNOPSIS update-passwd [options] DESCRIPTION update-passwd handles updates of /etc/passwd, /etc/shadow and /etc/group on running Debian systems. It compares the current files to master copies, distributed in the base-passwd package, and updates all entries in the global system range (that is, 0-99). OPTIONS update-passwd follows the usual GNU command line syntax, with long options starting with…

update-pangox-aliases

Nov 22nd

Posted by Dhaval Soni in Section 8

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SYNOPSIS update-pangox-aliases DESCRIPTION update-pangox-aliases is a wrapper script for updating /var/lib/defoma/pango.d/pangox.aliases via defoma. If you don’t have any defomized font packages, it will generate that file using default XLFD which pango’s defoma script has. SEE ALSO defoma(1) AUTHOR This manual page was written by Akira TAGOH <tagoh@debian.org>, for the Debian GNU/Linux system. 24 March 2002…

glibc

Nov 22nd

Posted by Dhaval Soni in Section 7

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DESCRIPTION The term “libc” is commonly used as a shorthand for the “standard C library”, a library of standard functions that can be used by all C programs (and sometimes by programs in other languages). Because of some history (see below), use of the term “libc” to refer to the stan- dard C library is…

gitworkflows

Nov 22nd

Posted by Dhaval Soni in Section 7

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SYNOPSIS git * DESCRIPTION This document attempts to write down and motivate some of the workflow elements used for git.git itself. Many ideas apply in general, though the full workflow is rarely required for smaller projects with fewer people involved. We formulate a set of rules for quick reference, while the prose tries to motivate…

update-openoffice-dicts

Nov 22nd

Posted by Dhaval Soni in Section 8

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SYNOPSIS update-openoffice-dicts DESCRIPTION update-openoffice-dicts can be used to regenerate dictionary.lst for openoffice. This script is run by myspell dictionaries when they are installed or removed. It is not normally necessary to run update-openoffice-dicts by hand. Packages containing dictionaries create a file in /usr/share/myspell/infos and call this script automatically. update-openoffice-dicts will create a new dictionary.lst if…

gittutorial-2

Nov 22nd

Posted by Dhaval Soni in Section 7

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SYNOPSIS git * DESCRIPTION You should work through gittutorial(7) before reading this tutorial. The goal of this tutorial is to introduce two fundamental pieces of git’s architecture–the object database and the index file–and to provide the reader with everything necessary to understand the rest of the git documentation. THE GIT OBJECT DATABASE Let’s start a…

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