String replacement (${var/old/new}) in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace the first occurrence of 'cat' with 'dog' in the variable.

Bash Scripting

animal="cat and cat"
new_animal=${animal/$[1]/dog}
echo "$new_animal"

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

Aanimal

Bdog

Cand

Dcat

Attempts:

3 left

💡 Hint

Common Mistakes

Using double slashes // which replace all occurrences instead of one.

Replacing the wrong word like 'dog' instead of 'cat'.

The syntax ${var/old/new} replaces the first occurrence of 'old' with 'new' in the variable 'var'. Here, 'cat' is replaced by 'dog'.

2fill in blank

medium

Complete the code to replace all occurrences of 'apple' with 'orange' in the variable.

Bash Scripting

fruits="apple banana apple"
new_fruits=${fruits//$[1]/orange}
echo "$new_fruits"

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

Aapple

C/apple

Dbanana

Attempts:

3 left

💡 Hint

Common Mistakes

Using single slash / which replaces only the first occurrence.

Forgetting the double slashes and causing no replacement.

Using double slashes // in ${var//old/new} replaces all occurrences of 'old' with 'new'.

3fill in blank

hard

Fix the error in the code to replace 'red' with 'blue' in the variable.

Bash Scripting

color="red green red"
new_color=${color$[1]red/blue}
echo "$new_color"

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

A//

Bred/

C/

D/red/

Attempts:

3 left

💡 Hint

Common Mistakes

Using no slash or wrong placement of slashes.

Adding extra slashes causing syntax errors.

The correct syntax is ${var/old/new} with a single slash to replace the first occurrence of 'red' with 'blue'.

4fill in blank

hard

Fill both blanks to replace the first occurrence of 'cat' with 'dog' and then all occurrences of 'dog' with 'wolf'.

Bash Scripting

text="cat dog cat dog"
step1=${text$[1]cat/dog}
step2=${step1$[2]dog/wolf}
echo "$step2"

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

A/

B//

C/dog

D//cat

Attempts:

3 left

💡 Hint

Common Mistakes

Using double slashes for first replacement.

Using single slash for replacing all occurrences.

Use single slash / to replace first occurrence and double slash // to replace all occurrences.

5fill in blank

hard

Fill all three blanks to replace 'apple' with 'orange', then 'banana' with 'grape', and finally 'grape' with 'melon' in the variable.

Bash Scripting

basket="apple banana banana apple"
step1=${basket$[1]apple/orange}
step2=${step1$[2]banana/grape}
step3=${step2$[3]grape/melon}
echo "$step3"

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

A//

B/

Attempts:

3 left

💡 Hint

Common Mistakes

Using double slash for first replacement causing all to change.

Using single slash for later replacements causing only first to change.

Use single slash / to replace first occurrence and double slash // to replace all occurrences. Here, first replacement is single, next two are all occurrences.