grep (search text patterns) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to search for the word 'error' in the file 'log.txt'.

Linux CLI

grep [1] log.txt

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

A-v

B-i

C"error"

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Using options like -i or -v instead of the search pattern.

Forgetting to put the search word in quotes.

The correct syntax to search for the word 'error' is to put it in quotes after grep.

2fill in blank

medium

Complete the code to search for the word 'Warning' in 'system.log' ignoring case.

Linux CLI

grep [1] "Warning" system.log

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

A-v

B-i

C-r

D-c

Attempts:

3 left

💡 Hint

Common Mistakes

Using -v which inverts the match.

Using -r which searches recursively.

The -i option makes grep ignore case when searching.

3fill in blank

hard

Fix the error in the command to count lines containing 'fail' in 'report.txt'.

Linux CLI

grep [1] fail report.txt

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

A-c

B-i

C-v

D-n

Attempts:

3 left

💡 Hint

Common Mistakes

Using -i which ignores case but does not count.

Using -v which inverts the match.

The -c option counts the number of matching lines.

4fill in blank

hard

Fill both blanks to search recursively for 'TODO' in all files and show line numbers.

Linux CLI

grep [1] [2] TODO .

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

A-r

B-i

C-n

D-v

Attempts:

3 left

💡 Hint

Common Mistakes

Using -v which excludes matches.

Using -i which ignores case but is not needed here.

Use -r to search recursively and -n to show line numbers.

5fill in blank

hard

Fill all three blanks to search case-insensitively for 'error', count matches, and show filenames only.

Linux CLI

grep [1] [2] [3] error /var/logs/*.log

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

A-i

B-c

C-l

D-n

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up -c and -l options.

Forgetting to use -i for case-insensitive search.

Use -i for case-insensitive, -c to count matches, and -l to show filenames only.