Description
ufw is stands for Uncomplicated Firewall, this program is for managing a Linux firewall and aims to provide an easy to use interface for the user, as well as support package integration and dynamic-detection of open ports. ufw  is not intended to provide complete firewall functionality via its command interface, but instead provides an easy […]

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Introduction
When screen is called, it creates a single window with a  shell  in  it and then gets out of your way so that you can use the program as you normally would.  Then, at any time, you  can create new windows with other programs in them (including more shells), kill existing windows, view a list […]

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Using the command dd you can create swap file.
dd - convert and copy a file
First of all check the current swap size using the command ‘free’
$ free
Output
total used free shared buffers […]

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Using mysqldump
Using ‘mysqldump’ command you can take the mysql database backup. This command all the datas to a text file.
The syntax is
shell> mysqldump [options] db_name [tables]
shell> mysqldump [options] –databases db_name1 [db_name2 db_name3…]
shell> mysqldump [options] –all-databases
Backuping Examples:
shell> mysqldump -u root -p dbaseName > file.sql;
shell> Enter the password
Restoring Example:
Suppose, we have the database as file.sql, and we […]

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