Why text processing is Linux's superpower in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the first 5 lines of a file named 'data.txt'.

Linux CLI

head -[1] data.txt

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

A5

B10

C15

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number larger than 5 will show more lines than needed.

Forgetting the dash before the number causes an error.

The head command shows the first lines of a file. Using -5 shows the first 5 lines.

2fill in blank

medium

Complete the command to find lines containing the word 'error' in 'log.txt'.

Linux CLI

grep [1] log.txt

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

A'error'

B'debug'

C'info'

D'warning'

Attempts:

3 left

💡 Hint

Common Mistakes

Searching for the wrong word will not find the needed lines.

Omitting quotes can cause errors if the word has special characters.

The grep command searches for text. Using 'error' finds lines with that word.

3fill in blank

hard

Fix the error in the command to count lines in 'file.txt'.

Linux CLI

wc -l [1]

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

A-file.txt

Bfile.txt

Cfiletxt

D--file file.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Adding dashes before the filename causes errors.

Misspelling the filename leads to 'file not found' errors.

The wc -l command counts lines. The filename must be given plainly without extra dashes.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths for words longer than 3 letters in a list.

Linux CLI

{word: [1] for word in words if len(word) [2] 3}

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Alen(word)

Bword

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as the value instead of its length.

Using the wrong comparison operator in the condition.

This dictionary comprehension maps each word to its length only if the word is longer than 3 letters.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 0.

Linux CLI

result = [1]: [2] for k, v in data.items() if v [3] 0}

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

Ak.upper()

Bv

C>

Dk.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase keys instead of uppercase.

Including items with zero or negative values.

This comprehension creates a dictionary with keys in uppercase and includes only items where the value is greater than zero.