Inetd, tcpwrapper

Motivation

Often a server is not used often, but because it needs to take connections it must be running all the time. This consumes some memory. For simple servers that are only used once in a while, there is a nice soltuion: inetd. This is a small and simple server that starts server programs as soon as a connection comes in. This also enables you to write simple servers with a shell script.