File globbing (wildcards *, ?, []) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to list all files ending with '.txt' in the current directory.

Linux CLI

ls [1]

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

A*.txt

B?txt

C[a-z].txt

Dtxt*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '?txt' matches only files with exactly one character before 'txt'.

Using 'txt*' matches files starting with 'txt', not ending.

Using '[a-z].txt' matches only files with a single lowercase letter before '.txt'.

The wildcard '*.txt' matches all files ending with '.txt'.

2fill in blank

medium

Complete the code to list files with exactly three characters and ending with '.log'.

Linux CLI

ls [1]

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

A*.???

B?*.log

C???.log

D*.log

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*.log' matches any number of characters, not exactly three.

Using '*.???' matches files with any name and three-character extension.

Using '?*.log' matches files with at least one character before '.log', not exactly three.

The pattern '???.log' matches files with exactly three characters before '.log'.

3fill in blank

hard

Fix the error in the code to list files starting with 'data' followed by any single character and ending with '.csv'.

Linux CLI

ls data[1].csv

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

A*

B?

C[]

D[?]

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' matches zero or more characters, not exactly one.

Using '[]' or '[?]' is incorrect syntax for matching a single character.

The '?' wildcard matches exactly one character, so 'data?.csv' matches files like 'data1.csv'.

4fill in blank

hard

Fill both blanks to list files that start with 'log', followed by a digit between 1 and 3, and ending with '.txt'.

Linux CLI

ls log[1][2].txt

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

A[1-3]

B?

C*

D[a-z]

Attempts:

3 left

💡 Hint

Common Mistakes

Using '?' after '[1-3]' matches exactly one character, but we want any number.

Using '[a-z]' matches letters, not digits.

Using '*' alone does not restrict the digit.

The pattern '[1-3]*' matches files starting with 'log', then a digit 1 to 3, then any characters, ending with '.txt'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps filenames to their extensions for files with names starting with 'img' and extensions '.jpg' or '.png'.

Linux CLI

files = ['img1.jpg', 'img2.png', 'img3.gif']
result = { [1]: [2] for file in files if file.startswith('img') and file.endswith([3]) }

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

Afile

Bfile.split('.')[-1]

C('.jpg', '.png')

Dfile.split('.')

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'file.split('.')' returns a list, not the extension string.

Using a single string in endswith instead of a tuple misses multiple extensions.

Using wrong keys or values in the dictionary comprehension.

The comprehension maps each filename to its extension by splitting on '.' and filtering files ending with '.jpg' or '.png'.