The apt-get command is used to install software on the Raspberry Pi. apt-get is also used to update and remove the Raspbian software, which are also known as packages. This will also work if your are using any Debian-based operating system.
First, check that all packages are up to date:
sudo apt-get update
sudo apt-get upgrade
This can be run together as one entry:
sudo apt-get update; sudo apt-get upgrade
To install a package
sudo apt-get install [packagename]
To Un-install a package
sudo apt-get remove [packagename]
Search for Packages
(Do sudo apt-get update before you search)
sudo apt-cache search [packagename]
Check which Packages are installed
dpkg -l
or
dpkg --get-selections
To find out if a package is already installed
dpkg --get-selections | grep [packagename]
Clean up
It’s a good idea to do an occasional cleanup to make sure no unwanted files are left behind.
sudo apt-get autoclean