sed (stream editor) basics in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace the word 'apple' with 'orange' in the file fruits.txt.

Linux CLI

sed '[1]' fruits.txt

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

As/apple/orange/g

Br/apple/orange/g

Cd/apple/orange/g

Di/apple/orange/g

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'r' instead of 's' for substitution.

Forgetting the 'g' flag to replace all occurrences.

The 's' command in sed is used for substitution. 's/apple/orange/g' replaces all occurrences of 'apple' with 'orange'.

2fill in blank

medium

Complete the code to delete all lines containing the word 'banana' from the file fruits.txt.

Linux CLI

sed '/[1]/d' fruits.txt

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

Aorange

Bbanana

Capple

Dgrape

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong word inside the pattern.

Omitting the 'd' command to delete lines.

The command '/banana/d' tells sed to delete lines containing 'banana'.

3fill in blank

hard

Fix the error in the code to print only lines 2 to 4 from the file fruits.txt.

Linux CLI

sed -n '[1]p' fruits.txt

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

A2-4

B2;4

C2,4

D2.4

Attempts:

3 left

💡 Hint

Common Mistakes

Using a dash '-' instead of a comma ',' for range.

Using semicolon or dot which are invalid for ranges.

The correct range syntax in sed is '2,4' to specify lines 2 through 4.

4fill in blank

hard

Fill both blanks to replace the first occurrence of 'cat' with 'dog' only on lines containing 'pet' in the file animals.txt.

Linux CLI

sed '/[1]/s/[2]/dog/' animals.txt

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

Apet

Bcat

Cdog

Danimal

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the pattern and the word to replace.

Using 'dog' as the pattern to match instead of 'cat'.

The command '/pet/s/cat/dog/' replaces the first 'cat' with 'dog' on those lines.

5fill in blank

hard

Fill all three blanks to append the line 'End of file' after the last line of the file report.txt.

Linux CLI

sed '[1][2]\
[3]' report.txt

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

A$

Ba

CEnd of file

Di

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'i' instead of 'a' which inserts before the line.

Not using '$' to target the last line.

The command '$a\nEnd of file' (newline after 'a') tells sed to append 'End of file' after the last line ($) of the file.