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1. Which regular expression character matches any one character?
- .
- ?
- +
- *
2. Which regular expression character matches zero or more of the previous character?
- ?
- +
- *
- .
3. Which regular expression character matches one or more of the previous character?
- –
- $
- *
- +
4. Which of the following regular expression characters is an extended regular expression character?
- +
- .
- $
- *
5. What does “|” do in a regular expression?
- Redirects input to the command
- Redirects output from the command
- Separates repetition modifiers
- Separates alternative patterns that can be matches
6. The regular expression a? is equivalent to:
- a{0,1}
- a{1}
- a{1,}
- a{0,}
7. The regular expression a* is equivalent to:
- a{0,1}
- a{1,}
- a{0,}
- a{1}
8. The regular expression a+ is equivalent to:
- a{1}
- a{1,}
- a{0,}
- a{0,1}
9. To use extended regular expressions, you can use: (choose two)
- grep -e
- fgrep
- egrep
- grep -E
10. To use regular expression characters to match themselves, you cannot:
- Put the character in the square brackets
- Use the fgrep command
- Use the slash in front of the character
- Use the backslash in front of the character
11. What is NOT a purpose of using parentheses around parts of a regular expression?
- They can be used to make alternation more efficient
- They can be used to refer back to what was matched
- They can be used to group characters for repetition
- They can be used to change the order that the pattern is evaluating
12. Which option for grep will invert the pattern matching results?
- -i
- -v
- -r
- -o
13. If you want to use grep without regard to the capitalization of text, you can use the option:
- -t
- -v
- -i
- -r
14. To get the grep command to show the names of files that matched instead of the content that matched, you can use the option:
- -q
- -l
- -f
- -n
15. What is the reason you would use the grep command with a quiet -q option?
- You want the output to be small
- You want to use the logical outcome of the command
- You want the output to be redirected to a file
- You don’t want grep to make noise
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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 make alternation more efficient
They can be used to refer back to what was matched
They can be used to change the order that the pattern is evaluating
To get the grep command to show the names of files that matched instead of the content that matched, you can use the option:
-q
-l
-f
-n
Updated, thanks so much!
What is the reason you would use the grep command with a quiet -q option?
You want the output to be small
You want to use the logical outcome of the command
You want the output to be redirected to a file
You don’t want grep to make noise