Environment variables in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the value of the HOME environment variable.

Linux CLI

echo $[1]

Drag options to blanks, or click blank then click option'

AHOME

BPATH

CUSER

DSHELL

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names like PATH or USER instead of HOME.

Forgetting the dollar sign ($) before the variable name.

The HOME environment variable stores the path to the current user's home directory. Using echo $HOME prints this path.

2fill in blank

medium

Complete the code to set a new environment variable named MY_VAR with the value 'hello'.

Linux CLI

export [1]='hello'

Drag options to blanks, or click blank then click option'

AMY_VAR

BVAR

CHELLO

DMYVAR

Attempts:

3 left

💡 Hint

Common Mistakes

Not using export so the variable is not available to other programs.

Using lowercase or incorrect variable names.

To create an environment variable, use export followed by the variable name and its value. Here, MY_VAR is the variable name.

3fill in blank

hard

Fix the error in the code to append ':~/bin' to the PATH environment variable.

Linux CLI

export PATH=$PATH:[1]

Drag options to blanks, or click blank then click option'

A$PATH

B~/bin

CPATH

D$PATH:

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'PATH' without the dollar sign, which treats it as a string.

Placing the colon in the wrong place.

Not using the tilde (~) for the home directory.

To add a directory to PATH, prepend or append the directory path. Here, ~/bin is the directory to add. The correct syntax is export PATH=$PATH:~/bin.

4fill in blank

hard

Fill both blanks to create a variable named COUNT with value 5 and print it.

Linux CLI

export [1]=[2]
echo $COUNT

Drag options to blanks, or click blank then click option'

ACOUNT

B5

C10

DVALUE

Attempts:

3 left

💡 Hint

Common Mistakes

Putting spaces around the equals sign.

Using the wrong variable name or value.

First, set the variable name COUNT to the value 5 using export. Then, echo $COUNT prints the value.

5fill in blank

hard

Fill all three blanks to create a variable named USERNAME with the current user and print a greeting.

Linux CLI

export [1]=$(whoami)
echo "Hello, $[2]! Your shell is $[3]."

Drag options to blanks, or click blank then click option'

AUSERNAME

CSHELL

DUSER

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in export and echo.

Forgetting to use command substitution with $(whoami).

Using USER instead of SHELL for the shell variable.

Set USERNAME to the current user using $(whoami). Then print a greeting using $USERNAME and the SHELL environment variable.