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3.1 Dozvole pod linux os

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Pregled i kratak opis dozvola nad direktorijumima i datotekama kod Linux operativnih sistema.

Dozvole pod linuksom

Svaki direktorijum ili datoteka koji postoje u Linuksovom sistemu datoteka, ima definisane dozvole za sledeće kategorije korisnika:

  • vlasnika (owner),
  • grupu (group) i
  • ostale (others)

Vlasnik je korisnik (sistemski ili ljudski) koji je kreirao datoteku. Vlasnik može postati i neko drugi - preuzimanjem vlasničke uloge.

Grupa je grupa korisnika - obično ona kojoj pripada vlasnik.

Ostali podrazumevaju sve druge korisnike sistema.

Dozvole se odnose na čitanje ( r ead), pisanje ( w rite) i izvršavanje (e x ecute). Na primer: ako u nekom direktorijumu unesemo ls -l , dobijamo spisak datoteka i direktorijuma, pri čemu svaki od njih ima tri grupe slova - za vlasnika, za grupu i za ostale. Na primer: ako datoteka spisak ima dozvole rwxr-xr--, to znači da vlasnik može da čita, piše i izvršava (rwx) tu datoteku, grupa može da čita i izvršava (r-x), a ostali mogu samo da čitaju (r--).

Slika1. pregled dozvola

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
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Can you compute that for me. Ty
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what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
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A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
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Maurice Reply
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Maurice
answer
Magreth
progressive wave
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Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, Mandriva 2009 spring. OpenStax CNX. Feb 28, 2013 Download for free at http://cnx.org/content/col11494/1.2
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