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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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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