/ . - / (, , , ). ( , , ..), . , , . . (, "" ) WIMP - . (, ), . : , . , , . , : / . , . , , , , , / .
, , , ( , !) , , , .
, , . :
1. - .
2. - .
3. ( ) - ().
, , / . DOS . UNIX 2> 2>>, .
UNIX >$ ( UNIX 0, - 1, - 2. UNIX 0 >$ 2 , , , , ).
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, , , . . , '|' . - "" , '|'. :
sort < mylist | more.
mylist sort more.
UNIX , . tee. , cat UNIX . :
cat first | tee second
first second, .
:
DOS > prn UNIX lpr
:
cat first | tee second | lpr
first second, .
lpr .