A Bourne Again Daemon
In Unix-like systems, a daemon is a process that runs in the background, usually providing some kind of service. Most daemons can be identified in the process list because their names end in d. Examples are the Apache web server (httpd) and the OpenSSH server (sshd). Another thing daemons usually have in common is that they are written in the C programming language. To create a daemon quickly, you can throw one together using the Bourne Again Shell (Bash) scripting language.
More about daemons
There are a couple of other common daemon characteristics. They often have a configuration file with a name ending in ".conf". You can tell a daemon to read its configuration file again by sending it signal HUP (1). Lastly, daemons usually listen on a particular TCP or UDP port for incoming network connections. The network functionality is the only feature we won't duplicate using Bash. It is possible to add a network aware program to a Bash daemon, but that is left as an exercise for the reader.
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