Text Manipulation

Question 1

How do you display the first 5 lines of a file?

Answer 1

head -n 5 file.extension

Question 2

How do you display the last 3 lines of a file?

Answer 2

tail -n 3 file.extension

Question 3

How do you display the output of a file starting from line 2?

Answer 3

tail -n +2 file.extension

Question 4

How do you sort a file by alphabetical order?

Answer 4

sort file.extension

Question 5

How do you sort a file by alphabetical order but in reverse order?

Answer 5

sort -r file.extension

Question 6

How do you display the first 3 letters of ever line in a file?

Answer 6

cut -c 1-3 file.extension

Question 7

What does grep “ap[pe]” file.extension do?

Answer 7

Returns any lines that contain the characters “app” or “ape”

Question 8

What does grep “.ap” file.extension do?

Answer 8

Returns any lines that contain the characters any character, followed by “ap”

Question 9

What does grep “ap*l” file.extension do?

Answer 9

Returns any lines that contain characters “a”, followed by p, followed by p (0 or more) and l

Question 10

What does grep -E “el?o” file.extension do?

Answer 10

Returns any lines that contain characters that starts with an “e”, followed by “l”, followed by an “l” (optional), and ends in a “o”

Question 11

How do you get the word count of a document?

Answer 11

wc -l file.extension