Chp 1.2

Question 1

>

Answer 1

Creates a new file containing standard output. If the specified file exists, it’s overwritten. No file descriptor necessary.

Question 2

>

Answer 2

Creates a new file containing standard output. If the specified file exists, it’s overwritten. No file descriptor necessary.

Question 3

> >

Answer 3

Appends standard output to the existing file. If the specified file doesn’t exist, it’s created. No file descriptor necessary.

Question 4

2>

Answer 4

Creates a new file containing standard error. If the specified file exists, it’s overwritten. File descriptor necessary.

Question 5

2»

Answer 5

Appends standard error to the existing file. If the specified file doesn’t exist, it’s created. File descriptor necessary.

Question 6

&>

Answer 6

Creates a new file containing both standard output and standard error. If the specified file exists, it’s overwritten. No file descriptors necessary.

Answer 7

Sends the contents of the specified file to be used as standard input. No file descriptor necessary.

Question 8

<

Answer 8

Accepts text on the following lines as standard input. No file descriptor necessary.

Question 9

<>

Answer 9

Causes the specified file to be used for both standard input and standard output. No file descriptor necessary.

Question 10

/dev/null

Answer 10

Device which is null and discard output to it.

Question 11

(or a pipe)

Answer 11

A pipe redirects the first program’s standard output to the second program’s standard input.

Question 12

tee

Answer 12

Used in conjunction with data pipes so that a program’s output can be both stored and viewed immediately.

Question 13

xargs

Answer 13

The xargs command builds a command from its standard input.

Question 14

> >

Answer 14

Appends standard output to the existing file. If the specified file doesn’t exist, it’s created. No file descriptor necessary.

Question 15

2>

Answer 15

Creates a new file containing standard error. If the specified file exists, it’s overwritten. File descriptor necessary.

Question 16

2»

Answer 16

Appends standard error to the existing file. If the specified file doesn’t exist, it’s created. File descriptor necessary.

Question 17

&>

Answer 17

Creates a new file containing both standard output and standard error. If the specified file exists, it’s overwritten. No file descriptors necessary.

Answer 18

Sends the contents of the specified file to be used as standard input. No file descriptor necessary.

Question 19

<

Answer 19

Accepts text on the following lines as standard input. No file descriptor necessary.

Question 20

<>

Answer 20

Causes the specified file to be used for both standard input and standard output. No file descriptor necessary.

Question 21

/dev/null

Answer 21

Device which is null and discard output to it.

Question 22

(or a pipe)

Answer 22

A pipe redirects the first program’s standard output to the second program’s standard input.

Question 23

tee

Answer 23

Used in conjunction with data pipes so that a program’s output can be both stored and viewed immediately.

Question 24

xargs

Answer 24

The xargs command builds a command from its standard input.