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Daemons

Daemons are special system applications which typically execute continuously in the background and
await requests for the functions they provide from other applications. Many daemons are network-
centric; that is, a large number of daemons executing in the background on an Ubuntu system may
provide network-related functionality. Some examples of such network daemons include the Hyper
Text Transport Protocol Daemon (httpd), which provides web server functionality; the Secure SHell
Daemon (sshd), which provides secure remote login shell and file transfer capabilities; and the
Internet Message Access Protocol Daemon (imapd), which provides E-Mail services.
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