Question

Question 11

1 point possible (graded)

The commands in the pipeline $ cat result.txt | grep "Harvard edX" | tee file2.txt | wc -l perform which of the following actions?

From result.txt, select lines containing “Harvard edX”, store them into file2.txt, and print all unique lines from result.txt.

From result.txt, select lines containing “Harvard edX”, and store them into file2.txt.

From result.txt, select lines containing “Harvard edX”, store them into file2.txt, and print the total number of lines which were written to file2.txt.

From result.txt, select lines containing “Harvard edX”, store them into file2.txt, and print the number of times “Harvard edX” appears.

unanswered

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Question 12

0/1 point (graded)

How is git rebase used?

To switch branches or restore working tree files incorrect

Uses a binary search to find the commit that introduced a bug

To reapply commits on top of another base tip

To reset the current HEAD to the specified state

To download objects and refs from another repository

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Question 13

1 point possible (graded)

Which of the following statements is wrong about Advanced Unix Executables, Permissions, and File Types?

In Unix, all programs are files/executables except for commands like ls, mv, and git.

which git allows a user to find the path to git.

When users create executable files themselves, they cannot be run just by typing the command - the full path must be typed instead.

ls -l can be used to inspect the permissions of each file.

Answer 1

Question 11:
The commands in the pipeline $ cat result.txt | grep "Harvard edX" | tee file2.txt | wc -l perform which of the following actions?
Answer:
From result.txt, select lines containing “Harvard edX”, store them into file2.txt, and print the total number of lines which were written to file2.txt.
Explanation:
cat result.txt opens the result.txt file,
grep "Harvard edX" will find the occurrence of Harvard edX,
tee file2.txt will copy the lines containing Harvard edX to file2.txt
wc -l will print the total number of lines in file2.txt

result.tx:

file2.txt:

output on terminal:

Question 12:
How is git rebase used?
Answer:
To reapply commits on top of another base tip
Explanation:
Rebasing is changing the base of your branch from one commit to another making it appear as if you'd created your branch from a different commit.

Question 13:

Which of the following statements is wrong about Advanced Unix Executables, Permissions, and File Types?

When users create executable files themselves, they cannot be run just by typing the command - the full path must be typed instead.

Explanation:

No need to enter the full path to run user-created executables in linux.