An operating system is the low-level software that schedules tasks, allocates storage, and handles the interfaces to peripheral hardware, such as printers, disk drives, screen, keyboard, and mouse. An operating system has two main parts: the kernel and the system programs.
At the very basic level, you need to set up Postfix SMTP server, also known as a MTA (Message Transport Agent). Postfix is a state-of-the-art message transport agent (MTA), also known as SMTP server. It is responsible for transporting messages from a mail user agent (or mail client) to a remote SMTP server.
If you are running a Linux distribution that use Systemd, then you may find that your command in /etc/rc.local file would not run on system boot. The rc-local.service already exists in systemd and, if rc.local exists and is executable, it gets pulled automatically into multi-user.target.
You may get confused over choosing Windows or Linux as host operating system in both server and desktop spaces. With focus on aspects of cost, the functionality provided, hardware compatibility, support, reliability, security, existing software, and other factors, here are reasons why Linux can be better option than Windows operating system.
The root user has unlimited privileges and can execute any command that may even accidentally damage your server. You can create a new user account with limited access. The sudo command provides a mechanism for granting administrator privileges to this new user.
Linux is a multi-user operating system, so it has security to prevent people from accessing each other’s confidential files. When you execute an 'ls' command, you are not given any information about the details of the files. You can get more information by using an option with the 'ls' command.
ls command is one of the most frequently used command in Linux. With no option, this command list files and directories in bare format where you won’t be able to view details like file types, size, modified date and time, permission and links. There are many options you can use with ls command.
VestaCP is open source hosting control panel that provides many features to manage domains, DNS, mail, databases, cron jobs, backups and much more. On Linux systems, a control panel is a graphical user interface (GUI) that displays a simplified set of controls for your system. Control panels are capable of installing, configuring, and updating common software packages and performing Linux system administration tasks.
Change the password as follows:
1. Open: /var/lib/roundcube/config/db.inc.php and then look for the password in the command
$rcmail_config['db_dsnw'] = 'mysql://roundcube:password@localhost/roundcube';
2. Copy the password only.
3. Now open: /etc/roundcube/debian-db.php
5. Replace "wrong_password" with the correct password that you just copied.
The chown command changes ownership (user or group) of files and directories in a Linux filesystem. Linux is designed to support a large number of users. Because of this, it needs to keep careful track of who is allowed to access a file, and how they can access it. These access rules are called permissions.
Before the introduction of the graphical user interface, UNIX and then Linux provided only a textual command-line interface. Today, a textual interface is available when you log in from a terminal, a terminal emulator, or a textual virtual console, or when you use ssh or telnet to log in on a system.