Find installed packages on Linux hosts

To find installed packages on a Redhat/CentOS Linux, use

rpm -qa | less

Once the package name is found, use this command to find more details

rpm -qil {package-name}

To find installed packages on a Debian (also Ubuntu) Linux, use

dpkg --list

Once the package name is found, use this command to find more details

dpkg -p {package-name}