apt
apt-get update
Download package lists. Packages change several times daily, so do this often.
apt-get dist-upgrade
Update all packages.
apt-get install <package(s)>
Install/upgrade specific package(s) (and its dependencies, if missing any).
apt-get mirror-select
Choose repositories and mirrors for use with apt (fedora.us specific extension).
apt-cache search <word>
Search all known packages entries (descriptions etc) for word.
apt-cache show <package>
Show basic information about a package.
See man […]