Description: search for files within Debian packages (command-line interface)
apt-file is a command line tool for searching files contained in packages for
the APT packaging system. You can search in which package a file is included or
list the contents of a package without installing or fetching it.
$ apt-file search /bin/screen
console-tools: /usr/bin/screendump
kbd: /usr/bin/screendump
screen: /usr/bin/screen
screenie: /usr/bin/screenie
screenie-qt: /usr/bin/screenie-qt
screenlets: /usr/bin/screenlets
screenlets: /usr/bin/screenlets-daemon
screenlets: /usr/bin/screenlets-manager
screenlets: /usr/bin/screenlets-packager
screenlets: /usr/bin/screenletsd
screenruler: /usr/bin/screenruler
screentest: /usr/bin/screentest