The location of startup files vary from system to system. The location and naming scheme of these files is beyond the scope of this book.
If you already have a local startup file, it's a pretty good idea to simply add the RunCache program to that file. Note that you should place RunCache in the background on startup, which is normally done by placing an '&' after the command.
The RunCache program attempts to restart Squid if it dies for some reason, and logs basic Squid debug output both to the file "/usr/local/squid/squid.out" and to syslog.