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Bash for loop is very first and important looping constructs in bash shell programming. Basically bash for loop is used for iterating over series of words within string.This Post describes Bash for loop with all necessary examples.

Your Storage system has reached almost to the end of support and you want to migrate to newer technologies. Area of concern here is downtime and data-loss.Of course you can do this using backup and restore methodology or using pvmove. However, smart way for performing storage migration using lvconvert. This method does not involve downtime also it guarantees 100% against data-loss.

This post describes How we can create FTP user with specific directory access. This enables us to restrict the user to only be able to do anything within that folder.

With the help of LVM snapshot backup we can freeze current state of an LVM volume. Making LVM snapshot backup make us to keep current state of volume and we can revert this state back if any needs arises during activity. A volume consists of two parts: file system metadata and the actual blocks containing data in a file.

How do you experience when something goes wrong on your system. You look at the system logs, of course! In all seriousness, understanding system logging is important so that you can troubleshoot when something went wrong. In Linux system we have syslog which captures every activity occurring on the system. Generally logs are stored on the local system at location “/var/log/messages” .However we can configure centralized syslog server where we can dump all the logs centrally to monitor all the logs in one go.

You must have seen my earlier post about replacing faulty disk in Linux raid , however if something goes wrong with system sometimes you need to stop and delete Linux Raid array. We will go first about how we can stop linux raid array. here is sample output of status of Raid array:

Configuring LINUX RAID 1 is very essential.....RAID partitions allows advanced features such as redundancy and better performance.

We can split and merge files in linux especially for large once with the split command, and to join you just need to cat the files into one file. Split can be used on binaries as well on text files.

With RHEL 7 RedHat has made significant changes the way Linux used to work. Here we are discussing New features in RHEL 7

Kali Linux is derived from Debian Linux flavor and its mainly used for penetration tasting. It has more than 300 pre-installed penetration-testing programs. It is a supported platform of the Metasploit Project’s Metasploit Framework, a tool for developing and executing security exploits.

Generally speaking Logs are very much important part of any troubleshooting activity, However these logs grows in size with time. In this case we need to perform log cleanup manually in order to reclaim the space and its tedious task to administer these logs. To overcome this we can configure logrotate utility available in Linux which automatically does rotation, compression , removal and mailing of logfile.