How to change hostname or FQDN in CentOS and Redhat In this tutorial we will learn about,how to change Hostname or FQDN in CentOS and Red Hat. The method is applicable to all Red Hat based operating system. I have described about difference between hostname and FQDN which you can read from this post (The […]
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This XML file does not appear to have any style information associated with it, RSS Feed problem(wordpress)
Mostly I use firefox and few days back I was working on RSS feed burner of my this Blog. I tested this blog in Google Chrome and surprised to see an Errr: “This XML file does not appear to have any style information associated with it” I checked my XML file and it looks fine. […]
How to find cpu processor supporting 64 bit or 32 bit
The post will explain, how to find cpu processor supporting 64 bit or 32 bit. In modern time, most of application are released with 64 bit compatibility only. Recently Chromium Dev team has announced in google forum about no support to 32 bit version in coming years. You should also know that 64 Bit Operating […]
rsync all files,hidden files,symlinks,hardlinks to remotes Linux Server
rsync all files,hidden files,symlinks,hardlinks to remotes Linux Server I have used these flags -ravpzHogt along with rsync command many times in server migration. And I always get good results. Key features** (1) Date Time stamp of files and folder remain same as you find in source server. (2) Hidden files or directory recursively transfer to […]
What is /dev/shm and how to mount /dev/shm
Introduction: This post will explain about the /dev/shm and you will also know how to mount /dev/shm in linux system. /dev/shm is nothing but implementation of traditional shared memory concept. It is an efficient means of passing data between programs. One program will create a memory portion, which other processes (if permitted) can access. This […]
Installing Nagios-3.4 in CentOS 6.3
Installing Nagios-3.4 in CentOS 6.3 This is how to install nagios 3.4 tutorial for installing nagios-3.4 in CentOS 6.3 in a few steps. rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-7.noarch.rpm yum install nagios nagios-devel nagios-plugins* gd gd-devel httpd php gcc glibc glibc-common Bydefualt on doing yum install nagios, in cgi.cfg file, authorized user name nagiosadmin is mentioned and for […]
How to find which filesystem is supported by running kernel
How to find which filesystem is supported by running kernel /proc/filesystems is the file which is used to detect the filesystems supported by running kernel. The nodev represent the file system is not assoicated with any disk partition for eg. /dev/sda1 In below given output, you can find out the ext3,ext4 and fuseblk can be […]
subtract integer written in columns from 2 different files
subtract integer written in columns from 2 different files This is an eg. of subtracting the integer value in column of file1 and file2. root@tuxworld:/mnt# for i in `seq 1 5`;do echo $i >> file1;done root@tuxworld:/mnt# for i in `seq 0 4`;do echo $i >> file2;done root@tuxworld:/mnt# cat file1 1 2 3 4 5 root@tuxworld:/mnt# […]
How to Check UUID of Disk Partition
In this post we will explain about UUID and to check UUId of disk partition in Linux systems. A universally unique identifier (UUID) is an identifier standard used in software construction, standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE). The intent of UUIDs is to enable distributed systems […]
Lock user login after failed login attempts in Red Hat 6.x and CentOS 6.x
In this article, we will learn how to lock user login after failed login attempts in Red Hat and CentOS. It is a security practice, which is important to implement in critical servers.
Terminal Recording with script and scriptreplay command
Learn how to do terminal recording with script and scriptreplay command.It is one of the useful command to record the activities on terminal. Morever after recording the terminal session you can play the session activity with the help of scriptreplay command. root@tuxworld:~# script -t 2>sample.time sample.log Script started, file is sample.log root@tuxworld:~# The script will […]
How to change hostname in Ubuntu 12.04 and 12.10 without system restart
In this post learn,how to change hostname in Ubuntu 12.04 and 12.10 without system restart. Here, there are few steps through which we can change the hostname of system without reboot. System OS: Ubuntu 12.04 LTS n l Follow steps to change hostname in Ubuntu 12.04 LTS and Ubuntu 12.10 Step 1: Edit the /etc/hosts […]
Convert hyphen to underscore in between all filenames shell script
In this post we will learn, how we can convert hyphen to underscore in between of all filenames with the help of shell script or bash script. For eg. if you want to convert the file haveing hyphen sign in between its name to Underscore . Use the below given method. After using the script […]
Enable ethernet in RHEL 6.0 and CentOS 6.0 : Tested In Virtual Box and VMware
Enable ethernet in RHEL 6.0 and CentOS 6.0 : Tested In Virtual Box and VMware Today I downloaded the CentOS 6.0 and installed it in Virtual Box.After installation I found that no ethernet was enable and has no ip Address. I tried to troubleshoot, restarted the network service,once again restarted the Machine but no luck […]
How to create iso file from CD/DVD and how to mount .iso file in folder
How to create iso file from CD/DVD and how to mount .iso file in folder Through the command line we can mount CD/DVD ROM and can create .iso file.In this post we will also see how to mount .iso file in a folder. Step (1) We will create .iso file in our home directory. U […]