How to list all manually installed packages?
20819
Generating list of manually installed packages and querying individual packages
135393
Why does Ubuntu Software Center not show every package available?
151498
How to find out if a specific package is installed on Debian?
110971
How can I get a list of all packages in a repository section from command line?
5342
How can I check if a package is installed (no superuser privileges)?
123958
How do I search for available packages from the command-line?
69489
How do I figure out what package something is in without resorting to Google?
19565
Restore default apt repositories in sources.list from command line
157663
a command to list all packagas installed on the system and their installed files, how?
99745
Enumerate All Installed Applications on OS X
143861
How to get all URLs for packages that would be installed for `apt install ` command
80819
Is there a command that outputs ONLY the packages explicitly installed by the user? (ubuntu/debian)
46618
How can I know what programs some apt-get package contains?
86913
How to create a list of installed packages for easy/automatic reinstall after disk is formatted
13326
How to list all installed software in terminal by recent date installed?
49658
Elegant way to check for missing packages and install them?
22506
Is there a way to find out whether an updated program/package lands in the official Ubuntu release repositories?