Processing Files

Question 1

cat

Answer 1

Displays a file on standard output (can be used to concatenate several files into one big file).

Question 2

cut

Answer 2

Extracts specified sections from each line of text in a file.

Question 3

dd

Answer 3

Copies blocks of data from one file to another (used to
copy data from devices).

Question 4

diff

Answer 4

Compares two text files and finds any differences.

Question 5

expand

Answer 5

Converts all tabs into spaces.

Question 6

file

Answer 6

Displays the type of data in a file.

Question 7

fold

Answer 7

Wraps each line of text to fit a specified width.

Question 8

grep

Answer 8

Searches for regular expressions within a text file.

Question 9

less

Answer 9

Displays a text file, one page at a time (can go backward also).

Question 10

lpr

Answer 10

Prints files.

Question 11

more

Answer 11

Displays a text file, one page at a time (goes forward only).

Question 12

nl

Answer 12

Numbers all nonblank lines in a text file and prints the lines to standard output.

Question 13

paste

Answer 13

Concatenates corresponding lines from several files.

Question 14

patch

Answer 14

Updates a text file using the differences between the original and revised copy of the file.

Question 15

sed

Answer 15

Copies a file to standard output while applying specified editing commands.

Question 16

sort

Answer 16

Sorts lines in a text file.

Question 17

split

Answer 17

Breaks up a file into several smaller files with specified size.

Question 18

tac

Answer 18

Reverses a file (last line first and so on).

Question 19

tail

Answer 19

Displays the last few lines of a file.

Question 20

tr

Answer 20

Substitutes one group of characters for another throughout a file.

Question 21

uniq

Answer 21

Eliminates duplicate lines from a text file.

Question 22

wc

Answer 22

Counts the number of lines, words, and characters in a text file.

Question 23

zcat

Answer 23

Displays a compressed file (after decompressing).

Question 24

zless

Answer 24

Displays a compressed file one page at a time (can go backward also).

Question 25

zmore

Answer 25

Displays a compressed file one page at a time.