How will check the httpd service status from rehdat ?

assuming that httpd is the process/service name.

then do as a root:

netstat -nap | grep -i httpd

or change httpd with the name of the process/service that is running.

you can use

# service httpd status

and

# netstat -nulp | grep -i80   to if it is running

many ways you can do that based on the Apache version and RHEL version you use so please let me know your version but for now you can use 

service httpd status