Pradeep Kumar 
After the release of Red Hat Enterprise Linux 7 (RHEL 7) , CentOS community has released its latest Operating System named as CentOS 7. Some of the new features in CentOS 7 as compared with CentOS 6.X are listed below : CentOS 7 uses XFS … Read more
Q:1 What is postfix and default port used for postfix ? Ans: Postfix is a open source MTA (Mail Transfer agent) which is used to route & deliver emails. Postfix is the alternate of widely used Sendmail MTA. Default port for postfix is 25. Q:2 … Read more
In Linux, It’s a security concern for organization to allow anyone to reboot the server using Ctrl-Alt-Del keys. It is always recommended in production boxes that one should disable reboot using Ctrl-Alt-Del keys. In this article we will discuss how can we disable reboot via … Read more
By default postfix only capture ‘From’ and ‘To’ details in the log file (/var/log/maillog). There are some scenarios where we want that email’s subject should be capture in the maillog. In this article we will discuss how to achieve this : We are assusming that … Read more
Badblocks is the command-line utility in Linux like operating systems which can scan or test the hard disk and external drive for bad sectors. Bad sectors or bad blocks is the space of the disk which can’t be used due to the permanent damage or … Read more
Awk is a scripting language which is used for processing or analyzing text files. Or we can say that awk command is mainly used for grouping of data based on either a column or field , or on a set of columns. Mainly it’s used … Read more
In this post, we will discuss how to use variables in bash shell scripting with examples. In every programming language variables plays an important role , in Linux shell scripting we can use two types of variables : System Defined Variables & User Defined Variables. … Read more
There are some scenario where system admin wants only few users should be allowed to transfer files to Linux boxes but no ssh. We can achieve this by setting up SFTP in chroot environment. Background of SFTP & chroot : SFTP stands for SSH File Transfer … Read more
Q:1 What does BIND Stands for ? Ans: BIND stands for Berkeley Internet Name Domain. Q:2 What is DNS Server and its fundamentals ? Ans: The Domain Name System (DNS) is a hierarchical, distributed database. It stores information for mapping Internet host names to IP … Read more
In this post, we will cover how to install and use putty on Ubuntu Linux. System Admins who had worked on Windows Operating system, surely they have used putty software to ssh UNIX like systems. When they migrated to Ubuntu Desktop , they might require … Read more
In this tutorial, we will cover how to install FilZilla in Ubuntu 22.04 LTS (Jammy Jellyfish) and Ubuntu 20.04 LTS and will also learn how to use filezilla. FileZilla is a free and open-source ftp client for both windows and Linux operating systems. It is … Read more
In this post, we will cover how to generate sos report on RHEL 8 and RHEL 9 system. Sos report is a command line tool in Linux distributions like RHEL and CentOS, which collects system configuration and diagnostic information of your linux box like running … Read more
