Class 23 Quiz

Question 1

What do [ and ] mean when used in an if statement?

Answer 1

they stand for the test command

Question 2

What are the keywords used to mark a block of commands in an if … then statement?

Answer 2

then and fi

Question 3

What are the keywords used to mark the first block of commands in an if … then … else statement?

Answer 3

then and else

Question 4

What are the keywords used to mark the second block of commands in an if … then … else statement?

Answer 4

else and fi

Question 5

What are the keywords used to mark the block of commands following elif?

Answer 5

then and either else or elif or fi

Question 6

Is there any limit to the number of blocks of commands you can have in an if … else … elif statement?

Answer 6

no

Question 7

How would you run the script do_something.sh if you wanted to print each line of the script before it was executed?

Answer 7

bash -x do_something.sh

Question 8

If you were debugging a script as in the example above, how would Bash mark the lines of the script itself to distinguish them from the output of the script?

Answer 8

by starting each line with a +

Question 9

What has to follow each elif in an if … else … elif statement?

Answer 9

a Unix command

Question 10

How does the test command indicate that the logical expression it is evaluating is true?

Answer 10

by returning a status code of 0