awk basics (field processing) 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'

ANF

B$1

C1

D$0

Attempts:

3 left

💡 Hint

Common Mistakes

Using $0 prints the whole line instead of the first field.

Using NF prints the number of fields, not a field value.

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

2fill in blank

medium

Complete the code to print the second and third fields separated by a dash.

Linux CLI

awk '{ print [1]"-"[2] }' file.txt

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

A$2

B$3

C$1

D$0

Attempts:

3 left

💡 Hint

Common Mistakes

Using $1 instead of $2 for the second field.

Using $0 prints the whole line.

In awk, $2 refers to the second field and $3 refers to the third field.

3fill in blank

hard

Fix the error in the code to print the last field of each line.

Linux CLI

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

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

A$NF

BNF

C$0

D$-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using NF alone prints the number of fields, not the field value.

Using $-1 is invalid syntax.

$NF in awk refers to the last field of the current line.

4fill in blank

hard

Fill both blanks to print the first field and the total number of fields separated by a space.

Linux CLI

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

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

A$1

BNF

C$NF

D$0

Attempts:

3 left

💡 Hint

Common Mistakes

Using $0 instead of $1 for the first field.

Using $NF instead of NF for the number of fields.

The first field is $1 and the total number of fields is NF.

5fill in blank

hard

Fill all three blanks to print the second field, the last field, and the total number of fields separated by commas.

Linux CLI

awk '{ print [1]","[2]","[3] }' file.txt

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

A$2

B$NF

CNF

D$1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up $NF and NF.

Using $1 instead of $2 for the second field.

The second field is $2, the last field is $NF, and the total number of fields is NF.