Ubuntu / Debian : List software from repository

This will list packages coming from a specific repository

grep <repository_name> /var/lib/apt/lists/* | grep tar | cut -d' ' -f4 | sort -u

Example

$ grep backbox /var/lib/apt/lists/* | grep tar | cut -d' ' -f4 | sort -u

aircrack-ng_1.1-1backbox1.debian.tar.gz
autotools-dev_20100122.1backbox1.tar.gz
backbox-about_1.2.tar.gz
backbox-artwork_1.6.tar.gz
...