A repository is the collection of packages for a Linux operating system. You can create a central repository containing the actual packages. Then configure your other systems to connect with the main repository. From where, you can install, update packages.
The Ubuntu and other Debian based systems uses APT (Advanced Packages Tool) as package manager. Apt keeps all the configuration files under /etc/apt directory.
This tutorial will help you to list all installed repositories under a Ubuntu or Debian based system via command line.
List Installed Repositories In Ubuntu
The remote repository references are configured in /etc/apt/sources.list file and all files under /etc/apt/sources.list.d/ directory.
Use the following command to list all the configured repositories on apt based system:
sudo grep -rhE ^deb /etc/apt/sources.list*
You will see the output like below:
deb http://mirrors.digitalocean.com/ubuntu/ xenial main restricted deb-src http://mirrors.digitalocean.com/ubuntu/ xenial main restricted deb http://mirrors.digitalocean.com/ubuntu/ xenial-updates main restricted deb-src http://mirrors.digitalocean.com/ubuntu/ xenial-updates main restricted deb http://mirrors.digitalocean.com/ubuntu/ xenial universe deb-src http://mirrors.digitalocean.com/ubuntu/ xenial universe . . . deb http://security.ubuntu.com/ubuntu xenial-security universe deb-src http://security.ubuntu.com/ubuntu xenial-security universe deb http://security.ubuntu.com/ubuntu xenial-security multiverse deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
Alternatively, you can use apt-cache command to list all repositories. This command will provide also provide more details about the repository.
Let’s try below command:
sudo apt-cache policy
Output:
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://ppa.launchpad.net/ondrej/php/ubuntu xenial/main amd64 Packages
release v=16.04,o=LP-PPA-ondrej-php,a=xenial,n=xenial,l=***** The main PPA for supported PHP versions with many PECL extensions *****,c=main,b=amd64
origin ppa.launchpad.net
500 https://deb.nodesource.com/node_13.x xenial/main amd64 Packages
release o=Node Source,n=xenial,l=Node Source,c=main,b=amd64
origin deb.nodesource.com
.
.
.
500 http://mirrors.digitalocean.com/ubuntu xenial/main amd64 Packages
release v=16.04,o=Ubuntu,a=xenial,n=xenial,l=Ubuntu,c=main,b=amd64
origin mirrors.digitalocean.com
Pinned packages:
Conclusion
In this tutorial, you have learned to find all the repositories configured on Ubuntu or Debian based system.