Installing Apps with Yum:

see yum page for more details

• yum -y check-update
  
• yum -y list installed lists all apps installed on host

• yum -y list downloads header info of all apps available for install and stores it locally
• yum -y check-update upgrades all out of date apps.
• yum search apache search what is available for install with the name "apache"
• yum install net-snmp-utils.x86_64 installs the app net-snmp-utils.x86_64
  
  

Installing Apps with RPMs:

•  rpm -i -UVh <filename.rpm> Install a rpm 
  

Starting and stopping services:

• service iptables start|stop|status|restart will do whatever to the iptables service.


Links:

• IPTables Overview