awk patterns and actions in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the first field of each line using awk.

Linux CLI

awk '{ print [1] }' file.txt

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

A1

BNF

C$1

D$0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of $1 prints the number 1 literally.

Using $0 prints the whole line, not just the first field.

In awk, $1 refers to the first field of the current line.

2fill in blank

medium

Complete the code to print lines where the second field equals 'error'.

Linux CLI

awk '$2 == [1] { print $0 }' logfile.txt

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

A"error"

Berror"

C'error'

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes causes awk to treat error as a variable.

Using single quotes inside the awk script breaks syntax.

String values in awk patterns must be enclosed in double quotes.

3fill in blank

hard

Fix the error in the awk command to print lines where the third field is greater than 100.

Linux CLI

awk '$3 [1] 100 { print $0 }' data.txt

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

A==

B<

C=>

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using => causes syntax error in awk.

Using == checks for equality, not greater than.

The correct operator for 'greater than' is >, not =>.

4fill in blank

hard

Fill both blanks to print the first and third fields separated by a space.

Linux CLI

awk '{ print [1], [2] }' file.csv

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

A$1

B$2

C$3

D"-"

Attempts:

3 left

💡 Hint

Common Mistakes

Using $2 instead of $3 prints the wrong field.

Using quotes instead of field variables prints literal text.

Use $1 for the first field and $3 for the third field to print them separated by a space.

5fill in blank

hard

Fill all three blanks to create a dictionary of words and their lengths for words longer than 3 characters.

Linux CLI

awk '{ if (length([1]) [2] 3) dict[[3]] = length($1) } END { for (w in dict) print w, dict[w] }' words.txt

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

A$1

B>

Cw

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using w before it is defined causes errors.

Using length as a key is incorrect.

Using < instead of > changes the condition.

Use $1 to get the word, > to check length, and $1 again as the dictionary key.