Ch8 Regular Expressions Exam

Ch8 Regular Expressions Exam

1. If you want to use grep without regard to the capitalization of text, you can use the option:

   • -v
   • -r
   • -t
   • -i

2. The regular expression a? is equivalent to:

   • a{0,1}
   • a{1,}
   • a{1}
   • a{0,}

3. The regular expression a* is equivalent to:

   • a{1}
   • a{0,1}
   • a{0,}
   • a{1,}

4. The regular expression a+ is equivalent to:

   • a{1,}
   • a{0,1}
   • a{0,}
   • a{1}

5. To get the grep command to show the names of files that matched instead of the content that matched, you can use the option:

   • -l
   • -n
   • -q
   • -f

6. To use extended regular expressions, you can use:

   (choose two)

   • grep -E
   • egrep
   • grep -e
   • fgrep

7. To use regular expression characters to match themselves, you cannot:

   • Put the character in the square brackets
   • Use the slash in front of the character
   • Use the fgrep command
   • Use the backslash in front of the character

8. What does the vertical bar | character do in a regular expression?

   • Separates repetition modifiers
   • Separates alternative patterns that can be matches
   • Redirects input to the command
   • Redirects output from the command

9. What is not a purpose of using parentheses around parts of a regular expression?

   • They can be used to group characters for repetition
   • They can be used to refer back to what was matched
   • They can be used to make alternation more efficient
   • They can be used to change the order that the pattern is evaluating

10. What is the reason you would use the grep command with a quiet -q option?

    • You do not want to write anything to standard output
    • You don’t want grep to make noise
    • You want the output to be redirected to a file
    • You want the output to be small

11. Which of the following regular expression characters is an extended regular expression character?

    • *
    • $
    • .
    • +

12. Which option for the grep command will invert the pattern matching results?

    • -o
    • -v
    • -r
    • -i

13. Which regular expression character matches any one character?

    • *
    • .
    • ?
    • +

14. Which regular expression character matches one or more of the previous character?

    • –
    • *
    • $
    • +

15. Which regular expression character matches zero or more of the previous character?

    • .
    • +
    • ?
    • *