I have been struggling to answer these questions and would really appreciate hel

Question

I have been struggling to answer these questions and would really appreciate help to answer them. Thank you!

Question #12: which flag to grep causes it to print matching lines without numbers? 0-1 ONo flag needed; this is the default behavior Question #13: Which is a grep-like regular expression which will match lines that include the substring "doh"? Cannot be done Odoh *doh [doh] Question #14: What does "sed" do? Selects some lines from the input to pass to the output. OShows only the last few lines of output. Breaks up lots of output into page-size chunks OIndividually edits each line of input. Re-arranges input lines OShows only the first few lines of output. Transforms input characters before passing them to output. Question #15: Which flag to grep causes it to consider upper-case different than lower-case? O-i 0-1 ONo flag needed; this is the default behavior -n Question #16: I have a program that prints out data in four columns, separated by spaces. I want to remove the spaces and cram all four columns together what command will work? sed af.// grep-v'' Oseds/ // OCannot be done None of the other answers is correct grep -vg'' Question #17: The commands "vi", "sed , and grep all use the same format for regular expressions. Which line below would match [Aejm ? I could not, would not, on a boat. OI do not like them in a box I do not like them with a mouse OI will not, will not, with a goat OI will not eat them on a train. OI do not like them with a fox OI will not eat them in the rain OI will not eat them in a house

Explanation / Answer

Solution:

This solution having explanation ,proper reason for true/false,

and examples for each one for your clear and better understanding.

Explanation :

before going to direct answer let's first understand the grep.

Grep is a unix/Linux operating system command that is used to find files having a given character ,
search files ,search words also allow regular expression for a string to be allowed etc.

There are many flags used to greap.

Now let's see the answer for given question:

12. -c or --count

This flag is used to print matching lines without numbers.

13.*doh*

Because

before doh there may be anytihng and also after doh there may be anything .

So atleast doh will be substring.

14.individually edit each line of input

sed is stream editior that is used to substitue ,replacec search insert delete the fiels.

15. -i

-i flag is used for above to differ upper case to lower case.

since everyting is provided for better and clear understanding .

However further if any difficulty in understanding the above then feel

free to ask.

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