Sec. 5: The Command Line

Linux users can skip the GUI when logging into the system locally via a text-mode console.

• True

• False

Answer explanation

True, some server-based distributions may not even have a GUI installed within them.

The default shell in most Linux distros is bash which stands for:

• Born Again Shell

• Beautiful Amazing Shell

• Bourne Again Shell

• Bash As Shell

Answer explanation

Bash is the default shell in most distributions. It stands for the Bourne Again Shell.

You can only run one instance of the shell.

• True

• False

Answer explanation

False

Which of the following is the correct order of a computer’s operation: (1) The computer executes the command, (2) The computer waits for user input, (3) The user selects a command and enters it via the keyboard or mouse

• 3, 2, 1

• 2, 3, 1

• 1, 2, 3

• 1, 3, 2

Answer explanation

The correct order is to wait for user input, the user enters a command to the computer, and then the computer executes the command.

Two types of command parameters are:

• Opinions and Debates

• Options and Arguments

• Opt-ins and Assessments

• Open and Argumentative

Answer explanation

A command is split into an array of strings named arguments. Argument 0 is (normally) the command name, argument 1, the first element following the command, and so on. An option is a documented type of argument modifying the behavior of a command, e.g. -l commonly means "long", -v verbose.

Commands must follow certain rules known as:

• Syntax

• Synapse

• Command Rules and Regulations

• Command Execute

Answer explanation

The standard Linux command syntax is "command [options]" and then "<arguments>". The "command [options]" and "<arguments>" are separated by blank spaces. A Linux command is usually an executable program residing on the Linux disc. In our example, "ls" is the command name.

Which of the following is NOT correct when naming variables?

• Variable names must start with a letter

• Underscores are used instead of embedded spaces

• Variable names must start with numbers

• Punctuation marks are not allowed

Answer explanation

Variables do not have to start with numbers.

To see all the variables that are in the user’s environment, use the _______ command.

• printvar

• ping

• printenv

• processvar

Answer explanation

he command printenv is used to display all of the variables in a user’s environment.

The generic name given to the action of protecting shell meta-characters from being treated specially by the shell:

• Quitting

• Quoting

• Quilting

• Queuing

Answer explanation

If you want to send a meta-character to a program, you must quote the meta-character. this means you must tell the shell to ignore its special meaning.

This is a set of pages that explain every command available on the system:

• Man pages

• Script pages

• Master pages

• Book pages

Answer explanation

A man page (short for manual page) is a form of software documentation usually found on a Unix or Linux operating system. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.