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Exam 7: Working With the Bash Shell

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Question 21

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To see a list of all exported environment and user-defined variables in the shell, you can use the ____ command.

A) env
B) set
C) setenv
D) getenv

E) A) and B)
F) A) and C)

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Question 22

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Match each term with the correct statement below. -Labels representing command input and output.

A) hashpling
B) tee
C) environment variables
D) stdin
E) stderr
F) decision construct
G) shell scripts
H) stdout
I) file descriptors

J) B) and I)
K) A) and E)

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Question 23

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The file descriptor stdin is represented by the number ____.

The ____ command can be used to replace characters in a file sent via Standard Input.

The BASH shell assumes stdout in the absence of a numeric file descriptor. _________________________

Most commands that are run by the shell are run in a separate ____________________, which is created by the current shell.

What are file descriptors? What are the three file descriptors are available to each command that can be manipulated by the BASH shell, and what is the purpose of each?

Match each term with the correct statement below. -A filter command that takes information from standard input and sends that information to a file, as well as to standard output.

Match each term with the correct statement below. -Shell variables that are typically set by the system and contain information that the system and programs access regularly.

You can send the standard output of one command to another command as standard input using the ____ shell metacharacter.

The file descriptor stderr is represented by the number ____.

The ____ environment file is always executed immediately after login for all users on the system, and sets most environment variables, such as HOME and PATH.

Aliases are shortcuts to commands stored in special variables that can be created and viewed using the alias command. _________________________

You can use the BASH shell to redirect standard output and standard error from the terminal screen to a file on the filesystem using the ____ shell metacharacter followed by the absolute or relative pathname of the file.

The ENV environment variable represents the location of the BASH run-time configuration file. _________________________

The ____________________ command takes user input from stdin and places it in a variable specified by an argument.

To see a list of the environment variables and their current values on a system, you can use the ____ command.

Match each term with the correct statement below. -The normal output of a command.

To prevent a file from being cleared by the BASH shell and append output to the existing output, you can specify three > metacharacters alongside the file descriptor.

Any command that can be executed on the command line can also be placed inside any environment file.