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Clear RAM Cache, Buffer, and Swap Space on Linux System - How to do it ?

This article covers how to clear the cache and buffer memory of the physical memory along with clearing the swap space when needed.

Every Linux System has three options to clear cache without interrupting any processes or services.


If you want to clear Swap space, you may like to run the below command.

$ swapoff -a && swapon -a


To Clear PageCache, dentries and inodes:

$ sync; echo 3 > /proc/sys/vm/drop_caches


To Clear PageCache only:

$ sync; echo 1 > /proc/sys/vm/drop_caches


To Clear dentries and inodes:

$ sync; echo 2 > /proc/sys/vm/drop_caches


Create and Use Bash Aliases on Ubuntu 20.04 Linux System - Step by Step Process ?

This article covers the procedure of creating and using bash aliases. Running long and complex commands is usually tedious and time-consuming. Aliases provide much-needed relief by providing shortcuts to those complex commands.

These shortcuts can easily be called on the terminal and yield the same result as the complex command. 

This tutorial shows how to create and add aliases permanently to your bash shell on Linux and Unix-like systems.


To Create Bash Aliases

Creating aliases in bash is very straight forward. 

The syntax is as follows:

alias alias_name="command_to_run"

An alias declaration starts with the alias keyword followed by the alias name, an equal sign and the command you want to run when you type the alias. 


Create and Run a Shell Script in CentOS 8 - Step by step process to do it ?

This article covers how to create and run a simple shell script in CentOS 8 system. With this, you can easily create and run even complex scripts and automate repetitive tasks. 

If you are using other Linux distributions, you can visit our posts on how to create and run a shell script in Ubuntu , Debian , and Linux Mint .


An SH file is a script programmed for bash, a type of Unix shell (Bourne-Again SHell). It contains instructions written in the Bash language and can be executed by typing text commands within the shell's command-line interface.


To write and execute a script:

1. Open the terminal. Go to the directory where you want to create your script.

2. Create a file with . sh extension.

3. Write the script in the file using an editor.

4. Make the script executable with command chmod +x <fileName>.

5. Run the script using ./<fileName>.


Create and Run a Shell Script in Linux Mint 20 - Step by Step process to perform this ?

This article covers the method of creating and running a shell script in Linux Mint 20.

With this, you can write and execute complex shell scripts in Linux Mint 20 very easily.


To write and execute a script:

1. Open the terminal. Go to the directory where you want to create your script.

2. Create a file with . sh extension.

3. Write the script in the file using an editor.

4. Make the script executable with command chmod +x <fileName>.

5. Run the script using ./<fileName>.


To save a .sh file in Ubuntu:

1. Run nano hello.sh.

2. nano should open up and present an empty file for you to work in.

3. Then press Ctrl-X on your keyboard to Exit nano.

4. nano will ask you if you want to save the modified file.

5. nano will then confirm if you want to save to the file named hello.sh.


To Make a Bash Script Executable in Linux:

1) Create a new text file with a . sh extension.

2) Add #!/bin/bash to the top of it. This is necessary for the “make it executable” part.

3) Add lines that you'd normally type at the command line.

4) At the command line, run chmod u+x YourScriptFileName.sh.

5) Run it whenever you need!


Create and Run a Shell Script in Debian 10 -Step by step process to do it ?

This article covers how to easily create a shell script and automate repetitive jobs in #Linux. Shell scripts are just a series of commands that you add in a file and run them together.  


To write and execute a #script:

1. Open the #terminal. Go to the directory where you want to create your script.

2. Create a file with . sh extension.

3. Write the script in the file using an editor.

4. Make the script executable with command chmod +x <fileName>.

5. Run the script using ./<fileName>.


#Shell is a #UNIX term for an interface between a user and an operating system service. 

Shell provides users with an interface and accepts human-readable commands into the system and executes those commands which can run automatically and give the program's output in a shell script.


Different Methods to Find Your Private IP Address in Linux Mint 20 ?

This article covers different methods to quickly find the IP address of your #Linux Mint system. 

The simplest way to check the ip address of linux Mint, when using the bash shell is typing the command ifconfig. 

On typing the ifconfig you will not only be provided with the ip address, but also the mac address, subnet mask and other information. 


The following commands will get you the private IP address of your interfaces:

1. ifconfig -a.

2. ip addr (ip a).

3. hostname -I | awk '{print $1}'.

4. ip route get 1.2.

5. nmcli -p device show.


What is the #ipconfig command for Linux?

ifconfig(interface configuration) command is used to configure the kernel-resident network interfaces. It is used at the boot time to set up the interfaces as necessary. 

After that, it is usually used when needed during debugging or when you need system tuning.


Ways to Find Your IP address in Ubuntu 20.04 LTS

This article will guide you on how to check your private IP address in #Ubuntu 20.04 LTS system. 

ifconfig command is used to display or configure a network interface.

To use command prompt (CMD) to find my #IP #address:

1. Open the command prompt: if you have a Start menu in your Windows system, open it and type cmd into the search bar.

2. Type ipconfig into the command prompt (or the Run box).

3. Find your IP address within the text that pops up.

You can also use the following commands will get you the private IP address of your interfaces:

i. ifconfig -a.

ii. ip addr (ip a)

iii. hostname -I | awk '{print $1}'

iv. nmcli -p device show.


Methods to shutdown Debian 10 from the command line and GUI ?

This article will guide you on how to shut down your Debian 10 system properly using different methods.

If you run a desktop environment, there is usually an option to "log out" available from the #application menu that allows you to shutdown (or #reboot) the system. 

Alternatively you can press the key combination Ctrl+Alt+Del.

To shut down #Linux:

1. To shut down the system from a terminal session, sign in or "su" to the "root" account. 

2. Then type ``/sbin/shutdown -r now''. It may take several moments for all processes to be terminated, and then Linux will shut down.


Different methods to create and run a Shell script on Ubuntu 20.04 LTS ?

This article will guide you on different methods of creating and running a #shell #script in #Ubuntu 20.04. Shell Scripting is an open-source #computer program designed to be run by the #Unix / #Linux shell. Shell Scripting is a program to write a series of commands for the shell to execute. To write and execute a script: 1. Open the #terminal. Go to the directory where you want to create your script. 2. Create a file with . sh extension. 3. Write the script in the file using an editor. 4. Make the script executable with command chmod +x . 5. Run the script using ./.


How to know Ubuntu version via command line ?

This article will guide you on how to check your Ubuntu version so that you can apply patches and update versions for security and performance reasons. The Process of Checking the #Ubuntu version in the #terminal ? i. Open the terminal using "Show Applications" or use the keyboard shortcut [Ctrl] + [Alt] + [T]. ii. Type the #command "lsb_release -a" into the command line and press enter. iii. The terminal shows the Ubuntu version you're running under "Description" and "Release".


How To Run a Script In Linux?

This tutorial will guide you on how to write a simple shell script and run a script in Linux operating system with help of chmod and other commands.


How to Set Up OpenVPN Server on Debian 10 ?

This article will guide you on how to set up an OpenVPN server on Debian Linux 10 server.



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