list installed packages, dpkg -l rpm -qa info on an installed package, dpkg -s rpm -qi contents of an installed package, dpkg -L rpm -q -l package where a file belongs to, dpkg -S rpm -q -f extract package contents without installing, dpkg -x rpm2cpio file.rpm | cpio -idv
To debug makefile variable assigments. Use make -p (--print-data-base) to see which values get assigned to variables and where. Need to add to reading list: Managing projects with GNU make.
Note to self. It's ssh-keygen that can dump the host key fingerprint in a format suitable for PuTTY security alert comparisons. ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub