I installed httpd-devel by using
yum install httpd-devel
now how do I remove this and all the packages related to httpd-devel ?
You can remove any package that’s been installed by running this command:
rpm -e PACKAGE_NAME
If there’s any dependencies that also need to be removed, it would tell you about then when you go to remove the package.
-Eric
What is the difference between
yum remove httpd-devel
and
rpm -e httpd-devel
Nothing, really, there’s multiple ways to remove a package.
I like the rpm command better because it’s less typing 
-Eric