¿Cómo se comprueba si un paquete específico está instalado en Ubuntu?

How do you check if a specific package is installed in Ubuntu?

Open the terminal application or log in to the remote server using ssh (e.g. ssh user@sever-name ) Run command apt list –installed to list all installed packages on Ubuntu. To display a list of packages satisfying certain criteria such as show matching apache2 packages, run apt list apache.

Other notable ways of finding the package a file belongs to is using the online search provided by Ubuntu and Debian: Ubuntu: https://packages.ubuntu.com/ – scroll down to Search the contents o packages and enter the filename you’re looking for, as well as the distribution (Ubuntu version) and architecture.

The procedure is as follows to list installed packages:

1. Open the terminal app.
2. For remote server log in using the ssh command: ssh user@centos-linux-server-IP-here.
3. Show information about all installed packages on CentOS, run: sudo yum list installed.
4. To count all installed packages run: sudo yum list installed | wc -l.

Check dependencies of a package in Ubuntu and Debian based distributions

1. Checking dependencies with apt show.
2. Use apt-cache for getting just the dependencies information.
3. Check the dependencies of a DEB file using dpkg.
4. Checking dependencies and reverse dependencies with apt-rdepends.

If you know the name of the executable, you can use the which command to find the location of the binary, but that doesn’t give you information on where the supporting files might be located. There’s an easy way to see the locations of all the files installed as part of the package, using the dpkg utility.

If you use the -f option when performing an rpm query: The command will show the package that owns a file.

Debian or Ubuntu Linux commands to find out which package owns a file:

1. Open the terminal application.
2. Type the following command to find out what package provides /usr/bin/passwd file:
3. Type the following command to find out what package provides /usr/bin/passwd file:
4. Use apt-file package searching utility:

Procedure

1. Run the following command and enter y when prompted. (You will see Complete! upon sucessful installation.)
2. Verify the installation by running: $ jq –version jq-1.6.
3. Run the following commands to install wget: $ chmod +x ./jq $ sudo cp jq /usr/bin.
4. Verify the installation: $ jq –version jq-1.6.

On CentOS/Fedora based systems, there is only one package named “mailx” which is the heirloom package. To find out what mailx package is installed on your system, check the “man mailx” output and scroll down to the end and you should see some useful information.

A dependency occurs when one package depends on another. You might think it would make for an easier-to-manage system if no package depended on any others, but you’d face a few problems, not the least of which would be dramatically increased disk usage. Packages on your Linux system depend on other packages.

You may not know exactly which packages provides the missing file. In such cases, you can easily find out the packages that provides those missing files and install them in your Linux box as described in this guide. On Arch-based, there is a small command line tool called pkgfile, which is used to search files from packages.

Ubuntu has a lot of packages in the official package repository. It is really hard to find the package that you need to install unless you know the exact package name of the software/tool you’re trying to install.

Here, the package libpcre3-dev provides the library file libpcre.so as you can see in the screenshot below. So, if you need the library file libpcre.so, you will have to install the package libpcre3-dev on your Ubuntu 20.04 LTS machine.

To use apt-cache to list all the available packages in the system, type the following command at the prompt and press “Enter”. Note that we added “| less” to the end of the command.