For older versions of Ubuntu without the apt package manager, you can use the dpkg-query command. Using dpkg-query is similar to apt, but this command cannot be used with remote repositories.
To view installed packages with their versions and brief descriptions, run the following command:
sudo dpkg -l
Use less with the dpkg command to limit the output as follows:
sudo dpkg -l | less
The dpkg query command generates a brief list of installed packages. To search for a specific package, add grep. Here's how the command looks:
sudo dpkg -l | grep packageName
Remember to replace packageName with the actual package. For example, enter the following command to display installed packages related to PHP:
sudo dpkg -l | grep PHP
Additionally, you can request information about a specific package using dpkg-query. Here's the command:
sudo dpkg-query -W packageName
Replace packageName with the actual package name.
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