1. Which command displays all of your environment variables?

A. var

B. alias

C. printenv

D. tr

2. You can make custom names for commands using:

A. aliases

B. glob

C. operands

D. syntax

3. Because shell scripts are not compiled, they require a(n) _______ to run.

A. variable

B. absolute path

C. interpreter

D. empty directory

4. The trap command is triggered by:

A. default

B. signals

C. comments

D. syntax

5. Which of these files would not be matched by the command ls file?.txt

A. file1.txt

B. fileB.txt

C. file9.txt

D. file10.txt