Why environment setup customizes the shell in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the current shell environment variable.

Linux CLI

echo $[1]

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

ASHELL

BHOME

CPATH

DUSER

Attempts:

3 left

💡 Hint

Common Mistakes

Using PATH instead of SHELL will show executable search paths, not the shell.

HOME shows your home directory, not the shell.

The SHELL variable shows which shell is currently used. This helps customize the environment.

2fill in blank

medium

Complete the command to list all environment variables including custom shell settings.

Linux CLI

printenv | grep [1]

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

APATH

BUSER

CHOME

DSHELL

Attempts:

3 left

💡 Hint

Common Mistakes

Using PATH will show many unrelated variables.

USER or HOME do not relate to shell customization.

Using grep SHELL filters environment variables related to the shell, showing customizations.

3fill in blank

hard

Fix the error in the command to set a custom prompt variable in the shell.

Linux CLI

export PS1=[1]

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A"\u@\h:\w$ "

B'\u@\h:\w$ '

C\u@\h:\w$

D"\u@\h:\w$"

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes causes the prompt to show raw backslashes.

No quotes cause syntax errors.

The prompt variable PS1 needs double quotes to interpret escape sequences like \u and \w.

4fill in blank

hard

Fill both blanks to create an alias for listing files with details and human-readable sizes.

Linux CLI

alias ll='ls [1] [2]'

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

A-l

B-a

C-h

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Using -a shows hidden files but not size format.

Using -r reverses order, not size format.

The -l option lists files in long format, and -h shows sizes in human-readable form.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

Linux CLI

lengths = { [1] : [2] for [3] in words if len([3]) > 3 }

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

Aword

Blen(word)

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causes errors.

Not using len(word) as value misses the length.

The comprehension uses word as key, len(word) as value, and iterates over word in words.