Class 18

Question 1

What is special about a global variable?

Answer 1

you can use it in any subshell of the shell in which it was created.

Question 2

What are the limitations of a local variable?

Answer 2

you can only use it in the shell in which it was created

Question 3

What would you write on the command line to set the value of the local variable named team to Red Sox.

Answer 3

team=”Red Sox”

Question 4

If you define a local variable, can a script see the value of this variable?

Answer 4

no

Question 5

What would you write on the command line to create the global variable named school to UMass Boston.

Answer 5

export school=”UMass Boston”

Question 6

Write the command you would use in a script to ask the user to provide a value for a variable named dir

Answer 6

read -p “Directory: “ dir

Question 7

What command would you use to see all global variables?

Answer 7

env

Question 8

What character would you use if you wanted to run two commands in the foreground, one right after the other, on a single command line?

Answer 8

;

Question 9

What other two characters allow more than one command to be run on a single command line?

Answer 9

& and | (the pipe character)

Question 10

How can you continue a command onto the next line?

Answer 10

type \ immediately before hitting Enter