grep and Regular Expressions

Question 1

How do you search for matching characters?

Answer 1

grep

Question 2

How do you do a reverse grep to show everything except the search?

Answer 2

grep -v

Question 3

What is the regular expression to search the beginning of a line with matching characters?

Answer 3

i.e grep ^In file

Question 4

What is the regular expression to search the end of a line with matching characters?

Answer 4

$

i.e grep ing$ file

Question 5

What is the regular expression to search for a set of characters including an unknown character?

Answer 5

.

i. e grep .ast file
* equivalent of ? in globbing

Question 6

What is the regular expression to match zero or more preceding characters?

Answer 6

*

i. e grep www* file
* works opposite of globbing wildcard

Question 7

How do you grep with case insensitivity?

Answer 7

grep -i

Question 8

What is the regular expression to match multiple specified characters?

Answer 8

[]

i.e ls [SsLlPp]ink

Question 9

What is the regular expression to match specified numbers?

Answer 9

[1-9]

i. e ls script[1]
i. e ls script[2-7]

Question 10

What is the regular expression to omit characters when matching?

Answer 10

[^]

i.e ls [^Ioa]oft

Question 11

When running a command how do you run it against multiple arguments concurrently?

Answer 11

> command< {}

i.e touch{file1,file2,file3}