Try these Linux package management tips.
Linux Package Management Tips
1) To check if a package is available in repositories and if so available, to check the version and size of the package, as superuser run the following commands in respective distro:
Fedora, CentOS: yum list <package_name>
Ubuntu/Debian: aptitude search <package_name>
OpenSuse: zypper search <package_name>
2) To know the number and name of the packages installed
Fedora, CentOS, OpenSuse: rpm -qa
Ubuntu/Debian: dpkg -l
3) To list the repositories used for fetching the packages
Fedora : yum repolist
Ubuntu/Debian: cat /etc/apt/sources.list
OpenSuse: zypper repos
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