A more useful apt-cache subcommand is apt-cache policy. It clearly shows the installed version if any and the available version s. For example, here's output from a machine which has samba installed but not samba-dev :. Alternatively, you can use the dpkg command to get information about your current system.
APT is the software that manages the download of packages, dependency analysis, etc. Dpkg is the low-level software that carries out the actual installation of a package file. This shows a line beginning with i if the package is installed, and a line beginning with u or p or nothing at all if the package is not installed.
This won't do anything if the latest version of the package that's available in your distribution is already installed. It will install the package if it isn't installed yet, and it will upgrade it if you have an older version.
Will list packages you are interested with their current insstallation stauts. The output will be something like this. The first 2 characters tell the status - ii here means First i - marked for installation Second i - Successfully installed. There are other status codes like r meaning marked for removal, p meaning marked for purging etc. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to find out if a specific package is installed on Debian? Ask Question. If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Save my name, email, and website in this browser for the next time I comment.
Yes, add me to your new blog post notifications list. Terms of Service and other policies. Managed Solutions. SSL by brand. OK, I found it. It also shows which version is currently installed and which versions are available to install. Keep also in mind that locking is deactivated, so don't depend on the relevance to the real current situation! Reading package lists Step 7: Install Docker.
We are now ready to install Docker using the command below. Sudo apt install docker-ce. This will install Docker, start the engine and configure it to always start on boot. Sign up for free and start hosting virtual servers today! Installing Docker in Ubuntu Updating packages and installing dependencies needed: 2.
To install the latest version of docker: 4. Once installation is done, check status with. By default, root and user with sudo privileges can use Docker. During installation docker group is created. So if you want to allow to use Docker for non-root users, you can add user to the docker group. To make changes to take effect, logout and login to your machine. If you decided to completely remove Docker CE and related dependencies, run the following command:. During installation docker0 network interface is installed.
You can remove it with command:. Docker is an open-source technology that is used to deploy applications through containers. It is a relatively new platform but is constantly updated and features a wide community of users.
Docker is a great tool that solves the age-old dilemma between developers and system administrators — while developers say that an app works on their machines, system admins worry about changing its libraries and requirements.
With Docker, that is no longer a problem as it allows a more transparent method of communication. It is essentially a virtual machine, that lets you run images. Docker is highly popular among developers and can be installed without any problems in our favorite Linux distribution.
Docker is adaptable allowing users to carry out continuous testing, deploy and check outcomes as many times as they want, with as many implications. It becomes a laboratory in itself where a user can experiment with new commands to fill in the container and make it functional in various tasks.
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