6 - I/O redirection

Question 1

stdout

Answer 1

*file linked to the screen to which output is sent to

Question 2

stderr

Answer 2

*file linked to the screen to which status messages and errors are sent to

Question 3

stdin

Answer 3

*file attached to the keyboard which accepts inputs

Question 4

>

Answer 4

redirects stdout
*always rewrites from the beginning

Question 5

> >

Answer 5

appends stdout instead of rewriting an entire file (for example)

Question 6

file descriptors

Answer 6

numbers used by the shell to reference stdin/out/err (0,1,2)

Question 7

redirecting stdout/err

Answer 7

&>
2>&1 *used after redirecting stdout

Question 8

appending stdout/err

Answer 8

&»

Question 9

/dev/null

Answer 9

a file, system device, bit bucket
*accepts input and does nothing with it

Question 10

cat

Answer 10

copies stdin to stdout
*takes input from stdin on its own

Question 11

<

Answer 11

redirects stdin

Question 12

pipe operator

Answer 12

’|’
redirects stdout to the stdin of another command

Question 13

sort

Answer 13

a “filter”
*alphabetizes a list of data

Question 14

uniq

Answer 14

removes adjacent duplicates from a file

Question 15

wc

Answer 15

*word count
*displays the lines, word count, and byte size contained in files

Question 16

grep

Answer 16

matches a text pattern to itself within files

Question 17

tee

Answer 17

copies its stdin both to stdout and to one or more files