In this tutorial,we will learn how to use yum command to download rpm file without installing in linux system.It was before RHEL 5 arrival, when I used to download the source rpm packages by using up2date -d package-name Now things are changed,in Red Hat based Operating System above version 5.x . We use the yum…
While working on Apache Module in Ubuntu,I found rewrite problem in Apache Web Server.I tried to enable the rewrite module but got this error ERROR: Module rewrite does not exist!.After troubleshooting,I found the problem was with mod_rewrite module. After doing some more troubleshooting,it is found that the rewrite.load file was missing in /etc/apache2/mods-available/ . Now,I…
In this tutorial we will learn,how to find installed and enabled apache module in Debian/Ubuntu. The method is applicable to Debian based operating system.As a system admin, sometimes we have to find which Apache module is installed. Every System Admin has their own style of work. How generally we do ,I am sharing in this…
Question : I am newbie in Linux.I have a question,How to read logs which are writing continuously.I am using the Linux CentOS Server and wants to read the mail.log which is filling continuously.I just want to read the logs at the same time,when log file writing is running Answer: To read the file which are…
In this tutorial we will learn,how to install MongoDB server on Ubuntu 12.04 LTS. MongoDB is one the popular nosql database.It is a cross-platform document-oriented database system.MongoDB has its interactive shell called mongo .In recent years,many companies started using MongoDB.To know about more details on MongoDB,you can visit the Wikipedia link How to install MongoDB…
In this post we will learn about how to save iptables permanently on Ubuntu.When we work on Red hat based Operating system like RHEL and CentOS.We can permanently set the iptables rule in /etc/sysconfig/iptables file . When you work on Ubuntu Operating System,you may find you are only able to set the iptables rule temporarily….
In this post we will learn,Run cron job alternate week day. Today, I met with very good question i.e how to run cron job alternate week day. The user wants to run the script in alternate Saturday.When I read this question first time,it make me to take a pause for a while. Later thinking on…
This is a useful trick to temporarily change the shell after login. The user can change its shell without doing logoff and restart the machine.For eg. a user require to change the shell in system to perform various commands. What is shell ? A Unix shell is a command-line interpreter or shell that provides a…
In this post I am sharing a trick in which we will assign DKIM signature like Sendgrid do.The method is not excatly same but the task can be accomplished.I was getting “no signing table” error.Because of which DKIM-Signature was not attaching in recipient’s email header. My application mailer was using gmail id in from: field…
In this post,I am sharing a useful option with linux grep command.In this tutorial, we will use grep command to show lines after and before the keyword . As a Linux System Engineer, sometimes I get the requirement to print lines above and below of a particular keyword in the file. Generally if you only…
Today in this example we will use bash script. The task is replace keyword with its filename without extension.To accomplish this task we will use bash script.In bash script we will use for loop and sed command .To elaborate this example,lets assume we have 4 files called file1.txt red.txt blue.txt roger.txt The above each file…
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After getting annoyed with spammers,I decided to disable the website URL in comment form.Because I usually create theme and most of the time I customize the theme. While this journey of reading,once I read this wordpress codex page http://codex.wordpress.org/Function_Reference/comment_form . I have never created plugin in WordPress hence decided to create a plugin called Hide-n-Disable-comment-url-field.zip…
In this tutorial we will learn about, how to install vshell frontend on Nagios Core 4 Ubuntu 12.04 LTS. Nagios vshell is php based web interface for Nagios Core.It is lightweight and easy to customize. To get the details of Nagios Vshell , here is the link. To install vshell frontend on Nagios Core 4…
In this tutorial we will install and configure nagios core 4 on Ubuntu 12.04 LTS. Nagios Core 4 has recently been released,at the time of writing this post Nagios core 4.0.2 was available. Nagios is one of the most popular,reliable and robust Monitoring System.You can find number of plugins to monitor the network and server…
In this tutorial we will learn, how to delete mail queue in Postfix .To clear the mail queue in Postfix, we will use the command called postsuper . Abbreviation of postsuper is Postfix superintendent . postsuper command can only be run by super user of the system eg. root . Postsuper command is used for…