The screen command under the Unix is used to execute processes inside a screen session. That means you can simply detach from the screen and keep working on that server. It is normally very helpful when you need to install some…
Author: Arunlal Ashok
Linux Systems Architect at Endurance International Group. Linux lover. Like to play on Linux console. I started this blog to share and discuss Linux thoughts.
Always happy for an open discussion! Write to arun (@) crybit (dot) com. Check about me for more details. About this blog and our strong members, check The team CryBit.com
Always happy for an open discussion! Write to arun (@) crybit (dot) com. Check about me for more details. About this blog and our strong members, check The team CryBit.com
How to change main domain of a cPanel reseller account with an existing domain name?
Hey!! Here are some tips on cPanel reseller account modification. It’s quite simple if the new domain you wish to set as primary of your WHM re-seller is not under the same account. It can be simply managed from the “Modify…
Introduction to Python – Say Hello World!
Why this category? Now-a-days we do not have much time to spend for repeated works. We all are busy with learning new things. And we required some automation tools to reduce the work load and save the time. Python is…
20 ls command usages and examples – Linux
ls – The linux command ls command is one of the most frequently used command in Linux. Even-though, we may not use all the options available but here I am explaining the different options of ls command. The command “ls”…
Simple steps to count emails in Exim mail queue for a specific sender/receiver
In Exim MTA(Mail Transfer Agent) there are a lot of options/commands available to manage the Email queue simply. Also, we can simply figure it out if there any spamming on that server which has Exim as MTA. We have already…
Process tracking with the help of csf
Process Tracking. This option enables tracking of user and nobody processes and examines them for suspicious executable or open network ports. Its purpose is to identify potential exploit processes that are running on the server, even if they are obfuscated to appear as…
[Solved] Error: Command line calculator ‘bc’ not found!
I got an error related to “bc” the command-line calculator while executing the MySQL tuning script. The fix was also simple 🙂 Error details Error: Command line calculator ‘bc’ not found! The “bc” is the command-line calculator for Linux. You…
Find the IP address is blacklisted or not in CSF!!
IP block in csf. The CSF will block external IPs (Inbound connections) for any Brute force attack or something like that (Multiple login failure, hacking attepts etc)found on the server. We can find out all details regarding the IP block…
How to install imagemagick in a cpanel server – Command-line option
imagemagik installation Yes, the imagemagik installation steps are simple for a cPanel server. Before installing you must have an idea about imagemagik. It’s simply an addon for your cPnel server that allows for image manipulation. ImageMagick® is a software suite…
How to open a port for a particular IP address using iptables, CSF and APF – A comparison
This is a very important and useful trick to block some ports from public. And open it for some IP address. It’s quite simple by configuring iptables with the help of applications like CSF or APF. By using iptables commands, blocking…
Quick way to remove all emails from the mail queue – Exim command line option
Remove emails from queue. We have already discussed a lot of topics regarding the Exim mail transfer agent (MTA). Here I am listing some command-line options to remove all emails from your server mail queue. We know the Exim command…
A simple note on Reverse DNS Record
Why this topic important? What are the uses of rDNS record? Yeah, we all know about forward DNS lookup and its working. It’s a topic directly focusing on “What is reverse DNS?” A domain name system (DNS) is simply points…
Exim command to remove emails from mail queue for a specific Sender/Receiver – The “exiqgrep” usage
We have already discussed the basic command usages of Exim mail server in one of the previous post. In this post I am explaining the command usages for finding or sorting emails in Exim mail queue for particular sender or…
How to check DDoS attack on windows server.
A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. As like in linux server we can use the netstat commnet here too. Here I am…
15+ switches of usermod command with example – Unix/Linux
The Unix/Linux command “usermod” is a useful one to alter the already created user via command line. The command Useradd or adduser is for creating a user in Linux system/server from its command prompt. The basic syntax for creting a…