Use streams, pipes and redirects

Question 1

What is stdin?

Answer 1

Standard Input - from keyboard

Question 2

What is stdout?

Answer 2

Standard Output - to screen

Question 3

What is stderr?

Answer 3

Standard Error

Question 4

What redirection operator creates a new file or overwrites if the file exists for standard output?

Answer 4

>

Question 5

What redirection operator creates a new file or appends if the file exists for standard output?

Answer 5

> >

Question 6

What redirection operator creates a new file or overwrites if the file exists for standard error?

Answer 6

2>

Question 7

What redirection operator creates a new file or appends if the file exists for standard error?

Answer 7

2»

Question 8

What redirection operator creates a new file or overwrites if the file exists for standard input and error?

Answer 8

&>

Question 9

Sends the contents of a file to be used as standard input?

Answer 9

<

Question 10

What redirection operator would accept text on the following lines as standard input?

Answer 10

«

Question 11

What redirection operator uses a file for standard input and error?

Answer 11

<>

Question 12

What device is used to discard messages?

Answer 12

/dev/null

Question 13

What command prints a message to screen as well as to a file?

Answer 13

tee

Question 14

What command builds a command list from it arguments?

Answer 14

xargs (eg find ./ -name “A” | xargs rm