This article is Part 7 of the LFCA series, here in this part, you will acquaint yourself with the general system administration commands to manage software packages in the Linux system.

As a systems administrator, you will be tasked with the responsibility of managing software packages. This includes installing, upgrading, and removing or uninstalling packages from your system.

There are two types of packages in a Linux system:

• Binary packages: These contain configuration files, executables, man pages among other documentation. For Debian, the binary packages have a .deb file extension. For Red Hat, the binary packages bear a .rpm file extension. Binary packages are unpacked using the Debian utility dpkg – For .deb binary files and rpm for .rpm binary packages as we shall see later on.
• Source packages: A source package is a compressed file that contains the source code of the application, a brief description of the package, and instructions on how to build the application.

Different Linux distributions have their own package managers and here, we are going to look at 2 Linux families: Debian and Red Hat.

Debian Package Management

Debian provides APT (Advanced Package Manager) as a front-end package management solution. It’s a powerful command-line utility that works with core libraries and allows you to download, install, update and remove packages from your system.

Install a Package in Debian/Ubuntu Systems

If you are coming from a Windows environment, you are used to downloading a .exe package from a software vendor and running it on your system using an installation Wizard.

In Linux, installing an application is quite different. Software packages are downloaded and installed from online repositories using a package manager. The list of repositories is defined in the /etc/apt/sources.list file and /etc/sources.list.d directory.

On Debian-based distributions, the APT package manager is used to download and install packages from the online repositories. Not only does it install a package but also the dependencies required by the packages

It’s always recommended to update the repositories in the /etc/apt/sources.list file before installing any package. To accomplish this, run the command:

$ sudo apt update

To install a software package, use the syntax:

$ sudo apt install package_name

For example, to install Apache web server, run the command:

$ sudo apt install apache2

Search a Package Before Installing

To search for the availability of a package in the repositories, use the syntax:

$ apt search package_name

For example, to search for the availability of the package called neofetch, run the command:

$ apt search neofetch

Show Information of Package

To display more information about a package, use the apt command as follows.

$ apt show package_name

For example, to reveal more information about the neofetch package, run:

$ apt show neofetch

Upgrade Packages in Ubuntu

To upgrade the installed packages on your system run the command:

$ sudo apt upgrade

Remove Package in Ubuntu

To remove a software package, say apache2 run the command:

$ sudo apt remove apache2

To remove the package alongside the configuration files use the purge option as shown.

$ sudo apt purge apache2

The Dpkg Package Manager

Debian-based Linux distributions also offer the dpkg package manager. This is a low-level package manager that handles binary packages that do not require any dependencies during installation. If dpkg detects that a binary package file requires dependencies, it reports the missing dependencies and halts.

To install a package from a .deb file use the dpkg command as follows:

$ sudo dpkg -i package.deb

For example, to install the AnyDesk package from its Debian file shown, execute:

$ sudo dpkg -i anydesk_6.1.0-1_amd64.deb
OR
$ sudo dpkg --unpack  anydesk_6.1.0-1_amd64.deb

To check if the package was installed, run the command:

$ sudo dpkg -l anydesk

To remove the package, use the -r option as shown:

$ sudo dpkg -r anydesk

To remove the package alongside all its configuration files, use the -P option for purging all the files associated with the package.

$ sudo dpkg -P anydesk

YUM / DNF and RPM Package Management

Modern RedHat Linux distributions such as RHEL & CentOS 8 and Fedora 21 and later versions use DNF (Dandified YUM) which is an upgrade of the now deprecated YUM package manager, which was the de facto package manager for older versions of Red Hat Linux distributions such as RedHat and CentOS 7.

Just like APT, the DNF or YUM package managers are used to install packages from online repositories.

Install Software Packages in CentOS

To install a package, use the syntax:

$ sudo dnf install package-name
OR
$ sudo yum install package-name (For older versions)

For instance, to install the Apache httpd package, run the command:

$ sudo dnf install httpd
OR
$ sudo yum install httpd

Search for a Software Package

You can also search for the availability of a package from the repositories as follows:

$ sudo dnf search mariadb

Update Software Packages

To update all packages to their latest version execute:

$ sudo dnf update 
OR
$ sudo yum  update 

Remove Software Package

To remove a package run:

$ sudo dnf remove package_name
OR
$ sudo yum remove  package_name

For example, to remove the httpd package, run

$ sudo dnf remove httpd
OR
$ sudo yum remove httpd

The RPM Package Manager

The rpm package manager is another open-source package management tool for handling .rpm binary packages on RedHat Linux distributions. Just like APT package manager rpm manages binary packages.

Install Software Package

To install an application using a .rpm file, use the syntax below:

$ sudo rpm -i package_name

For instance, to install the AnyDesk application from the .rpm file shown, run the command:

$ sudo rpm -i anydesk-6.1.0-1.el8.x86_64.rpm 

To verify or check the presence of a software application on your system use the syntax:

$ sudo rpm -q package_name

For instance, to check if Anydesk is installed, run the command:

$ sudo rpm -q anydesk

To query all the present software packages, use the command:

$ sudo rpm -qa

Remove Software Package

To uninstall a package using the rpm command use the syntax:

$ sudo rpm -e package_name

For example:

$ sudo rpm -e anydesk

Conclusion

The apt, dpkg, rpm, dnf, and yum commands are handy command-line tools that can help you to install, update and remove software packages on your Linux system.

The above is the detailed content of LFCA: How to Manage Software Packages in Linux – Part 7. For more information, please follow other related articles on the PHP Chinese website!