Chapter 4. BUILDING AND SECURING DAEMONS
At the heart of almost all Linux appliances is one or more daemons, the background programs that provide a network or system service. You can get an idea of the daemons available on your Linux system by looking in the /etc/rc.d/init.d directory or by using the ps ax command to show the daemons you have running on your system.
The term daemon refers to a program that runs in the background without a controlling terminal. Daemons also run in their own process group in order to avoid inadvertently receiving signals meant for other processes. A daemon usually redirects standard input, output, and error to /dev/null or to a log file. Many daemons use a Process ID file (or pidfile) to enforce mutual exclusion ...
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