Browsing all articles in Linux
Mar
7

exim: remove mails in queue from a particular sender.

“spams”, its one of the major issue that a sys admin has to deal with throughout his job.  First you need to find the user who is generating it. You can get it from the mail headers.  Once you find the user, disable the script that was responsible for spams, but it may have already kept thousands(may be lacks) of mails in the exim queue waiting for its chance to get delivered.  To delete these mails one by one is impossible.  In a cPanel server having exim mail,  you can use the following command to delete mails in the current queue generated by that particular user only.

SSH into the server
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Mar
2

How to configure NAT with iptables on a VPS.

NAT ( network-address-translation ) with iptables  helps us in how to select the packets we want to mangle. We can easily configure NAT on a OpenVZ VPS by following the below steps.

Lets first consider a VPS in which NAT is not enabled. Trying to POSTROUTE from VPS throws you errors.

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Feb
25

How to disable gzip output on lightspeed server accounts

You can use .htaccess to disable gzip output if your website is running under a lightspeed server.

Open .htacess file and append following lines.

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Feb
19

Find Linux OS is 32 or 64bit.

There are several situations where you need to confirm whether your Linux OS installed  is 32bit or 64bit. People normally use uname -a to find it. But the following command will tell you exactly the machine   architecture.

getconf LONG_BIT

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Feb
5

songbird! iTunes for Ubuntu

Songbird is a opensource music player that utilizes the cross platform frameworks and will runs in Linux, Apple, Solaris & Windows.

You can get it downloaded for free from here

Linux System Requirements : read more

Nov
14

How to transfer a cPanel account to DirectAdmin.

The file structure and back-ups for both control panels are entirely different and its quite difficult to restore the files transfered from one to another control panel manually. There is a script available which can convert a cPanel back-up to the format that of a DirectAdmin. The convert process is quite simple.

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Oct
18

How to change Linux root password temporarily.

This is a simple technique by which you can have your our root password temporarily and change it back to the real one after use. The condition is

* You are logged in as root and you don’t know the root password

Back-up the current shadow file. read more

Oct
10

How to install winrar for Linux

You can install & use winrar for Linux. The installation is quite simple to follow even for Linux newbies.

Open a terminal, type sudo su – to switch to root.

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Oct
2

Install file splitter for Linux.

Download HJSplitlx file splitter for Linux from here :

tar -xzf hjsplitlx.tar.gz to extract the file HJSplitLX

Install the basic requirements :

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Sep
9

How to install flash player in Centos / Redhat.

This post can also answer the question ” how to fix the firefox error on centos/redhat linux”
Installing the flash player on centos/redhat linux seems to be very difficult sometimes. But the installation is quite simple :) . The flash player may not be installed automatically using firefox. While trying install firefox, you may get the error following error ” Firefox could not install this item because “install-0zr..rdf” (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.”The Screeshot of error is provided. To fix this issue, you need to upgrade/install certain libraries using yum. I have mentioned the commands below.

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