List all installed packages on Debian/Ubuntu
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dpkg -l
Install a package on Debian/Ubuntu
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sudo apt install packagename
Remove a package on Debian/Ubuntu
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sudo apt remove packagename
Update package list on Debian/Ubuntu
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sudo apt update
Upgrade all packages on Debian/Ubuntu
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sudo apt upgrade
Install a package on macOS with Homebrew
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brew install packagename
Update Homebrew and all packages
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brew update && brew upgrade
Search for a package in Homebrew
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brew search packagename
List installed Homebrew packages
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brew list