apt : command-line interface
[SYNOPSIS] apt OPTION COMMAND PKG
COMMAND
install Install package
remove Uninstall package
purge Delete packages and configuration files
search Search for packages by name or regular expression
show Show detailed information about the package
update Download the list of new and updateable packages
upgrade Update updatable packages
# apt upgrade package
Update the [package]
# apt upgrade
Update all installed packages
full-upgrade Perform updates that may also involve removing packages

OPTION
-y Say 'yes' to all questions
-v Display additional information
-h Show help