find puppet intalled in rhel linux

how to find the version  of puppet intalled in rhel linux

cmd : rpm -qa | grep puppet

puppetlabs-release-7-12.noarch
puppet-...x.noarch
puppet-server-x.x.x.x.noarch

know the linux version

how to know the linux version.
for kernel level.
1) uname -a
2) to know the redhat version then use.
cmd : cat /etc/redhat-release.

Know tomcat version on linux

Know tomcat version on linux

sudo rpm -qa | grep tomcat

output : tomcat-7.x.x.