010-160 Linux Command Line & Shell Scripting 4

Question 1

What does the command tail -f /var/log/syslog do?

Accepted Answer

Continuously displays new lines appended to syslog

Answer

Shows the first 10 lines of syslog

Answer

Deletes the syslog after displaying it

Answer

Shows syslog in reverse order

Question 2

In a bash for loop, which syntax correctly iterates over the values 1 2 3?

Accepted Answer

for i in 1 2 3; do echo $i; done

Answer

for i in (1 2 3); do echo $i; done

Answer

for (i=1; i<=3; i++); echo $i; done

Answer

foreach i (1 2 3) echo $i

Question 3

Which command prints the current working directory?

Accepted Answer

pwd

Answer

cwd

Answer

dir

Answer

where

Question 4

How do you redirect standard error (stderr) to a file named errors.txt?

Accepted Answer

command 2> errors.txt

Answer

command 1> errors.txt

Answer

command &> errors.txt

Answer

command >> errors.txt

Question 5

What character begins a comment in a bash script?

Accepted Answer

#

Answer

//

Answer

--

Answer

/*

Question 6

Which command makes a shell script named setup.sh executable?

Accepted Answer

chmod +x setup.sh

Answer

exec setup.sh

Answer

chown +x setup.sh

Answer

run setup.sh

Question 7

What does the command sort -r file.txt do?

Accepted Answer

Sorts file.txt in reverse (descending) order

Answer

Removes duplicate lines from file.txt

Answer

Sorts file.txt alphabetically in ascending order

Answer

Sorts file.txt by file size