Unix Multiple Choice Interview Questions and Answers | Page-6

(26) Command 1 || Command 2 means

[A] execute command 2 if command 1 is successful

[B] execute either command 1 or command 2

[C] execute command 2 if command 1 is unsuccessful

[D] none of the above

Answer: Option [C]

(27) The default shell in UNIX OS is

[A] ksh

[B] sh

[C] csh

[D] bsh

Answer: Option [D]

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(28) The ‘pipe’ system call in UNIX is used to:

[A] create a duplicate of a file

[B] create a named pipe

[C] create an unnamed pipe

[D] none of these

Answer: Option [B]

(29) The number of default files open for every program when it starts is :

[A] 2

[B] 4

[C] 6

[D] none of these

Answer: Option [A]

(30) The command ‘Sa.out 2>output’ redirects

[A] standard error file

[B] standard input file

[C] standard output file

[D] none of these

Answer: Option [A]

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