Getting installed services in RHEL

Today I was asked how you could discover those services that are installed on a system.

For packages installed today;
rpm -ql $(rpm -qa --last | 
grep "$(date +'%a %d %b %Y')" | 
awk '{print $1}') | 
grep systemd | 
grep service | 
awk -F"/" '{print $NF}' | 
grep -v '@'

From the beginning of time;
rpm -ql $(rpm -qa --last | 

awk '{print $1}') | 
grep systemd | 
grep service | 
awk -F"/" '{print $NF}' | 
grep -v '@'

From using these you can then ask which are enabled on start up;

systemctl list-unit-files --type=service |

grep enabled |

egrep $(

  rpm -ql $(rpm -qa --last | 

  grep "$(date +'%a %d %b %Y')" | 

  awk '{print $1}') | 

  grep systemd | 

  grep service | 

  awk -F"/" '{print $NF}' | 

  grep -v '@' | 

  tr '\n' '|' | 

  sed 's/|$//'

)