daemon

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daemon

[′dē·mən]
(computer science)
In Unix, a program that runs in the background, such as a server.

daemon

(operating system)
/day'mn/ or /dee'mn/ (From the mythological meaning, later rationalised as the acronym "Disk And Execution MONitor") A program that is not invoked explicitly, but lies dormant waiting for some condition(s) to occur. The idea is that the perpetrator of the condition need not be aware that a daemon is lurking (though often a program will commit an action only because it knows that it will implicitly invoke a daemon).

For example, under ITS writing a file on the LPT spooler's directory would invoke the spooling daemon, which would then print the file. The advantage is that programs wanting files printed need neither compete for access to, nor understand any idiosyncrasies of, the LPT. They simply enter their implicit requests and let the daemon decide what to do with them. Daemons are usually spawned automatically by the system, and may either live forever or be regenerated at intervals.

Unix systems run many daemons, chiefly to handle requests for services from other hosts on a network. Most of these are now started as required by a single real daemon, inetd, rather than running continuously. Examples are cron (local timed command execution), rshd (remote command execution), rlogind and telnetd (remote login), ftpd, nfsd (file transfer), lpd (printing).

Daemon and demon are often used interchangeably, but seem to have distinct connotations (see demon). The term "daemon" was introduced to computing by CTSS people (who pronounced it /dee'mon/) and used it to refer to what ITS called a dragon.

daemon

Pronounced "dee-mun" as in the word for devil, as well as "day-mun," a daemon is a Unix/Linux program that executes in the background ready to perform an operation when required. Functioning like an extension to the operating system, a daemon is usually an unattended process that is initiated at startup. Typical daemons are print spoolers and email handlers or a scheduler that starts up another process at a designated time. The term comes from Greek mythology, meaning "guardian spirit." See agent and mailer-daemon.
References in periodicals archive ?
Without a mediating act of volition to counter the daemonic conscience, he has become Despair.
It is Juana who "outs" him by detecting a "priestly" note in his singing voice, but it is Sharp, the "'daemonic' tough-guy," who finesses a theory--"'every man has got five percent of that in him'"--that permits him to reassert his masculinity.
(14) It is not only Bainbridge but also Dominic Pino who is highly critical of Rudich's (mis)reading of the poem in "Coleridge's Kubla Khan," saying he (Rudich) is "wrong on many accounts." Convincingly demonstrating that the word "daemonic" is used in Kubla Khan to mean "a benevolent, transcendent power that is associated with nature" just as "savage" is used "to represent a primordial state, a place unaffected by the corruption of man," Pino too claims that Rudich takes those words in today's sense of something brutal and evil (which is wrong in the context of the poem), and that Rudich's analysis highlighting the negative similarities between Kubla Khan and Napoleon is simply "incorrect" (n.
(28) It remains possible that the conventional view is right and that, despite his god-filled worldview, Socrates greeted the daemonic voice with skepticism, suspending judgment until he had tested it sufficiently.
Richard Wright, Daemonic Genius: A Portrait of the Man, A Critical Look at his Work.
Symptoms require interpretation and Holmes situates the locus in the transition from daemonic to naturalistic explanation.
Myth, he considers to be that necessary or salutary lie which any governing class must tell the governed in order to arrest and control the daemonic movement of the passions in ordinary men.
The spirit-pervaded stone of Gothic buildings, after a millennium of style-evolution, has become the soulless material of this daemonic stone-desert" (Spengler 1932 II: 99).
(Mostly likely, he is entirely, and happily, unaware of the fact.) Industrialism was inevitable in this sense only: To the most active and intelligent portion of the most active and intelligent species on earth (which also happens to be imbued with the divine spark), the daemonic urge to create something like our industrial system is wholly natural.
Bunin's portrait, as one might expect, is highly nuanced but often depicts Tolstoy as a daemonic soul; thus in his own way, Bunin gives support to a "chthonic Tolstoy" (Gorky 31-57; Bunin 3-13).