Intermediate Commands

Question 1

What does the [grep] command do?

Answer 1

It prints the lines from a file or input stream that match an expression.

Question 2

How is the [grep] command useful?

Answer 2

It’s handy when operating on multiple files at once because it prints the filename in addition to the matching filename.

Question 3

What is the syntax for the [grep] command which lets me which files contain a certain expression?

Answer 3

[grep expr /path/stream/*]

Question 4

what does [grep -i expr file/path] do?

Answer 4

It makes case-insensitive searches.

Question 5

What does [grep -v expr file/path] do?

Answer 5

It inverts the search. Printing all lines that don’t match.

Question 6

What do the commands [egrep] and [grep -E] both do?

Answer 6

It’s a more.powerful grep option that understands regular expressions.

Question 7

What makes regular expressions better understood by [grep] more powerful than patterns understood by [glob]?

Answer 7

Regular expressions are more powerful than wildcard patterns. *(More specific)?

Question 8

What does [.*] do in regular expressions?

Answer 8

It matches any number of characters, including none.

Question 9

What does [.+] do in regular expressions?

Answer 9

Matches any one or more characters.

Question 10

What does [.] do in regular expressions?

Answer 10

It matches exactly one arbitrary character.