Show space used by deb packages installed sorted by size (ubuntu, debian and like)

dpkg-query -W -f='${Installed-Size;10}t${Package}n' | sort -k1,1n

You can install Rails in a Fedora system with these commands…

yum -y install ruby ruby-devel ruby-irb ruby-libs ruby-rdoc ruby-ri rubygems
sudo gem update
sudo gem install rails --include-dependencies

Show all deb packages installed on the system

dpkg -l

If you are getting a ‘Can’t locate CPAN.pm in @INC’ error while opening cpan, you have not installed Bundle::Cpan. You can do that without Cpan - using yum

yum install perl-CPAN

This will install an RPM, and try to resolve all the dependencies for you using your repositories.

yum localinstall package_name.rpm

Install a rpm package

rpm -ivh package.rpm

Install a package using dpkg in Debian linux

dpkg -i package

I usually install these packages after I install Debian/KDE in a Laptop.

apt-get install ...
kdebase k3b gcc
vlc xine-ui mplayer xmms amarok
bzip2 ark
build-essentials binutils util-linux module-init-tools xfsprogs pcmcia-cs  procps oprofile
kde-guidance klaptopdaemon laptop-mode-tools

Install / upgrade a deb package from cdrom/dvd

apt-cdrom install package_name

Show space used by rpm packages installed sorted by size (fedora, redhat and like)

rpm -q -a --qf "%10{SIZE}\t%{NAME}\n" | sort -k1,1n