Check for installed packages before running install.packages()
49658
Elegant way to check for missing packages and install them?
144637
How to list all the packages which are installed from PPAs?
138747
How to list installed packages in apt that are not backed by a repository?
131858
How can I download THEN install packages?
6440
Can I see why a package is installed?
137726
Get the list of installed packages with install time, date and vendor details with dpkg-query command
75915
Where can I find a complete list of packages that I have installed after initial installation?
135161
How do I detect running processes using a library package?
2214
How to list all packages installed as dependencies in Terminal, and what installed them?
80816
Generate a log of all the installs on a system (whether apt-get/yum/pip/npm/...)
62293
How do I detect what .NET Framework versions and service packs are installed?
86913
How to create a list of installed packages for easy/automatic reinstall after disk is formatted
151498
How to find out if a specific package is installed on Debian?
121912
How can I search for packages depending on a exact package?
41054
How can I check the available version of a package in the repositories?
14777
How to check if a specific Windows security update is installed?
154248
How to see all packages in a package repository? Website or command line?