Obtain information about installed packages on CentOS and Ubuntu

CentOS / RHEL / Fedora

List all installed packages

rpm -qa

Get information about a specific package

rpm -qi <package name> 

List all files in a specific package

rpm -ql <package name> 

Combine the -a and -l options, in this exmaple we're searching for the package elasticsearch-5.5.2-1.noarch

package=$(rpm -qa | grep elasticsearch) && rpm -ql $package; 

Ubuntu

List all installed packages

dpkg-query -l

List all files in a specific package

dpkg-query -L <package name>