Quote:
/etc/rc.d/init.d/httpd
/usr/local/apache/bin/httpd
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The first is the script (it's an ascii file, so you can read it) that starts the apache web-server daemon at system startup by invocing the second (which is a binary file) with some options.
Also apachectl is a script used to start/stop/restart apapache at runtime if you make changes to the configuration.