linux

Changing the group of a user is quite easy and simple task, but it is not known to every user. In this topic we will tell you the commands through which not only you can add new user to a group but also change existing user's group too. The basic commands used are "useradd" and "usermod"...

To monitor and debug a Linux system performance is really a tough job for a system administrator in Linux. It's not quite easy for experts also to monitor and keep system up and running, But, there are many utilities through which monitoring your system becomes easy and reliable too. There are...

To display CPU information like number of CPUs, cores, threads, NUMA nodes, sockets, information about CPU caches, model, CPU family and stepping and their speed on Linux operating systems. We can get information about cpu using these commands lscpu, /proc/cpuinfo and lstopo (hwloc). These will...

Linux command check RHEL/CentOS kernel version : You can check CentOS kernel version through following command which works with all Linux distributions, such as Red Hat, CentOS, Debian, and Ubuntu. It also works on other UNIX-like operating systems such as HPUX, FreeBSD, OpenBSD, Solaris, etc...

There are several ways to get CentOS version information running on your system. Below given are examples through which you can get CentOS version. However, each one will not work for you but mostly works one of them. 1). You can check CentOS version through cat command (always works): ---- #...

The scp command in Linux is used to transfer files between machines over a secure, encrypted connection. It is similar to rcp. The general syntax to transfer a local file to a remote system is as follows: ----- scp source_file_name username@destination_host:destination_folder ----- The...

Linux is one of the most popular open source operating system and comes with huge set of commands. To check the total available space of the physical memory and swap memory we can use “free” command utility in Linux. The Linux “free” command gives information about total used and available space...

Importance of emails these days are very well known for information transfer. It provide a fast and reliable way to transfer your message instantly and secured. There are many email providers which provides you an interface to send or receive mails. But, what if we need to send emails through...

Find Command in Linux : The Linux Find Command is used to search and locate list of files and directories in Linux File system. You can find files on behalf of users, permissions, groups, date, size, file type and other possible criterias. Examples of Find commands : 1. Find Files Using Name...

rsync Command rsync means remote sync. rsync is a utility provided by linux to synchronize the files and folders from one location to another on same or remote server. rsync is basically used to perform backup task on Linux servers. Key features of rsync are : 1). Speed : the main and...

GREP command in Linux The GREP is abbreviation of "Global Regulation Expression Pattern". GREP command is a pattern search tool provided by Linux. By default it searches all matching lines from the file or files for the searched word. There are lot of switches(options) available with GREP...

Screen command in Linux Server : The screen command is a utility provided by Linux to execute some process under or inside a screen. By using this you can simply detach from the screen and keep working on that server without keep waiting for the process to get completed. It is quite very...

While working on Linux systems a question arises in our mind is that how can we find out disk space utilization information using command line option? Well, great news is, Linux has a inbuilt utility "df" to check disk space usage: Linux commands to check disk space df command – Shows the...

Well, i will not recommend to do this as it may cause some problem to networking on your server. But, for those who want to do this here is the solution. On CentOS mostly we do not need ipv6 as network configuration are done on ipv4. So to disable Ipv6 networking and prevent kernel module from...

LSOF commands LSOF is the short form of "LiSt Open Files". It is a command line utility which is used to list the information about the files that are opened by various processes. In unix, everything is considered as a file, ( pipes, sockets, directories, devices, etc.). So by using lsof, you...

What is ImageMagick ? It's a software suite which allows image manipulation and can read and write images in a various formats (over 100) including JPEG-2000, DPX, GIF, EXR, JPEG, PDF, PNG, Postscript, SVG, and TIFF. ImageMagick is a software suite which facilitates the ability to create, edit...

PHP handler : A PHP handler defines the method that Apache uses to communicate back and forth with PHP scripts. A php handler loads the php modules and that determines how the php pages loaded on the server. Different types of available PHP handlers are suPHP, DSO, CGI FastCGI. On Linux server...

CSF(Config Server Firewall):- CSF(Config Server Firewall) is a Firewall application which is mostly use by Linux server. It provide various options to control and manage Linux server Firewall through commandline and control panel. CSF configures linux server firewall to manage access to FTP...

Maldet (Linux Malware Detect):- Maldet is a malware detector which is mainly used in Linux based servers. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures for detection. It will be very useful...

508 Resource Limit Reached Error : This error often comes to the domains which are hosted on CloudLinux server. On CloudLinux installed server every account has allotted a fixed amount of resources to use. This is just beacuse of CloudLinux installed server, as it uses LVE (Linux Virtualised...