Sorry guys, I’m swamped and have to do this pretty quickly this time around. Here’s at least something…(before you all steal my questions)
-adina
Question 1:
How do you print out the lines 71 — 80 of a 100 line file “foo.txt”?
A) head -n 80 foo.txt | tail -n 30
B) tail -n 30 foo.txt | head -n 10
C) head -n 71 test.txt | tail -n 10
D) tail -n 30 foo.txt > head -n 10
E) head -n 80 test.txt > tail -n 10
A — Wrong. This prints the 51 — 80 line of foo.txt. The “head” command takes the first 80 lines of the file and the “tail” command takes the last 30 lines of that output.
B — Correct.
C — Wrong — This prints out the 62-71 line of foo.txt. The “head” command takes the first 62 lines of the file and the “tail” command takes the last 10 lines of that output.
D — Wrong. The ‘>’ sends the output of the command “tail” to a file which cannot be a command.
E — Wrong. The ‘>’ sends the output of the command “head” to a file which cannot be a command.
How do you append the 71st line of “foo.txt” to the file “append.txt”?
| A) tail -n 30 test.txt | head -n 10 | head -n 1 | foo.txt |
| B) tail -n 30 test.txt | head -n 10 | head -n 1 > foo.txt | |
| C) tail -n 30 test.txt | head -n 10 | head -n 9 » foo.txt | |
| D) head -n 80 test.txt | tail -n 10 | head -n 1 > foo.txt | |
| E) head -n 80 test.txt | tail -n 10 | head -n 1 » foo.txt |
A — Wrong. This does return the 71st line but does not print out to a file.
B — Wrong. This does not print out the 71st line and does not append to a file.
C — Wrong. This does not return the 71st line but does append to a file.
D — Wrong. This does return the 71st line but does not append to a file.
E — Correct. Woot!