Unix


              

Unix


1.


UNIX

















2.
UNI
-
UNI


,



.


,
,






3. ()


( )

-



- 1: -















4.












1




/etc










()







5.


OPEN


,
READ

-,

,

WRI


,
CLOS
, lseek









STAT FST


pip
()








DU
dup
,


mount








LIN


UNLIN
link


Mechanical Desktop -
-
-
-
D-: 3D -

-
-
-
Shell -
-
Helix -
-
-
-
-