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Web Server signature is an information about the server and hosting operating system i.e. Apache version number and operating system info. By default configuration of Apache, any error page will show the full signature of the server (version number), that can be risky as it can be used by...

Due to spamming, spoofing and other malpractice email queue become loaded with thousand of unwanted emails. It will slow down your server performance and mainly affect your exim to deliver emails. It's not quite easy to sort out the genuine emails from these bulk spam mails as it is like finding...

How to check service status in Linux system (CentOS) ? Whenever we are troubleshooting any issue on server, we have to check service status on server whether they are running or not like Mysql, Apache, SMTP, TCP etc. To find out status of a service in Linux CentOS system, you can use SERVICE...

Nginx Error 413 Request Entity Too Large : This error is a very common error in nginx, which normally comes when we requests more information than is limited by PHP and Nginx configurations. It occurs on stand alone nginx server, when nginx acts as a front end server for apache at back end...

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"...

What is CHMOD command : CHMOD command is used to change file permission in Linux systems. There are three types of permissions you can set on file, which are given below : Read – This permission allows a user to only read the file. Generally, read permission is used for public views. Write –...

In today's world mostly people use USB flash memories for data transfer and storage. CD's and floppies are almost past now. USB Flash memories are compact and store more data with respect to CD's and Floppies. New Linux users find it difficult to use USB devices in Linux systems. The real...

Have you ever faced this error while accessing PhpMyAdmin in cPanlel ? "Access Denied Unable to establish a PHP session. If you believe that this is in error or inadvertent, contact your system administrator and ask them to review your server settings." Well, we have the solution for this error...

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...