Linux 1 -- Chapter 3

What is a shell variable?

• A command that executes a script

• A name that can be assigned a value

• A file that stores shell commands

• A directory path in the system

Which of the following is a valid name for a bash shell variable?

• 1variable

• variable-name

• _variable1

• variable!

How are shell variables treated in terms of case sensitivity?

• They are not case sensitive

• They are case sensitive

• Only uppercase variables are recognized

• Only lowercase variables are recognized

What is the effect of using double quotes (") around a variable value in bash?

• It prevents shell expansion

• It allows the expansion of variables

• It treats everything as a literal string including variables

• It converts the value to uppercase

What is the effect of using single quotes (') around a variable value in bash?

• It allows the expansion of variables

• It treats everything as a literal string, including variables

• It prevents the variable from being used

• It converts the value to lowercase

What is a child process in the context of shell scripting?

• A process that terminates another process

• Any process that is created by another process

• A process that runs in the background

• A process that is created by the operating system

By convention, how are local variable names typically written in bash?

• In uppercase characters

• In lowercase characters

• With numbers only

• With special characters

What is the convention for naming environment variables in bash?

• Use lowercase characters

• Use uppercase characters

• Use numbers only

• Use special characters

What does the $PATH variable represent in a shell environment?

• A list of all files in the root directory that are executable

• A list of directories where the system looks for executable files

• A list of all running processes and bin files

• A list of all built-in shell variables

How can you delete a defined variable in bash?

• Use the delete command

• Use the remove command

• Use the unset command

• Use the clear command