String suffix removal (${var%pattern}) in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to remove the shortest suffix matching '.txt' from the variable.

Bash Scripting

filename="document.txt"
result=${filename[1]

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

A%'.txt'

B%%'.txt'

C#'.txt'

D##'.txt'

Attempts:

3 left

💡 Hint

Common Mistakes

Using # or ## which remove prefixes instead of suffixes.

Using %% which removes the longest suffix, not the shortest.

The single % removes the shortest matching suffix pattern from the variable's value.

2fill in blank

medium

Complete the code to remove the shortest suffix matching any characters after the last dot.

Bash Scripting

filename="archive.tar.gz"
result=${filename[1]

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

A%.*

B##.*

C#.*

D%%.*

Attempts:

3 left

💡 Hint

Common Mistakes

Using %% which removes the longest suffix, removing more than intended.

Using # or ## which remove prefixes, not suffixes.

Using %.* removes the shortest suffix starting with a dot, effectively removing the file extension.

3fill in blank

hard

Fix the error in the code to correctly remove the shortest suffix '.backup' from the variable.

Bash Scripting

file="data.backup"
clean=${file[1]

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

A##.backup

B#.backup

C%%.backup

D%.backup

Attempts:

3 left

💡 Hint

Common Mistakes

Using # or ## which remove prefixes instead of suffixes.

Using %% which removes longest suffix unnecessarily.

Single % removes the shortest suffix '.backup' correctly; %% removes longest suffix which is unnecessary here.

4fill in blank

hard

Fill both blanks to remove the shortest suffix '.log' and then the longest suffix starting with a dot.

Bash Scripting

file="server.old.log"
step1=${file[1]
result=${step1[2]

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

A%'.log'

B%%'.log'

C%%.*

D%.*

Attempts:

3 left

💡 Hint

Common Mistakes

Using %% first removes too much.

Using %.* first removes shortest suffix starting with dot, not '.log'.

First remove shortest suffix '.log' with %, then remove longest suffix starting with dot with %%.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as filenames without extensions and values as original filenames, filtering only files ending with '.txt'.

Bash Scripting

files=("a.txt" "b.log" "c.txt")
result=([1]: [2] for f in files if [[ f [3] *.txt ]])

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

A${f%.*}

Bf

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of == in condition.

Using # or ## instead of % for suffix removal.

Use ${f%.*} to remove extension for key, f as value, and f == *.txt to filter files ending with '.txt'.