awk field extraction in scripts in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Bash Scripting

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

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

A2

B0

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using $1 instead of $2 prints the first field.

Using $0 prints the whole line, not a single field.

The $2 in awk prints the second field of each line.

2fill in blank

medium

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

Bash Scripting

awk '{ print $[1] "-" $3 }' data.txt

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

A1

B3

C0

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using $2 instead of $1 prints the wrong field.

Forgetting to add quotes around the dash causes syntax errors.

Using $1 and $3 prints the first and third fields. The dash is added as a string between them.

3fill in blank

hard

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

Bash Scripting

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

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

ANR

BNF

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using NR prints the line number, not a field.

Using $0 prints the whole line, not a single field.

NF is a special awk variable that holds the number of fields in the current line, so $NF prints the last field.

4fill in blank

hard

Fill both blanks to print fields 2 and 4 separated by a comma.

Bash Scripting

awk '{ print $[1] "," $[2] }' input.txt

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

A2

B3

C4

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up field numbers causes wrong output.

Forgetting quotes around the comma causes syntax errors.

To print the second and fourth fields, use $2 and $4 separated by a comma string.

5fill in blank

hard

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

Bash Scripting

awk '{ if(length($[1]) > [2]) print $[3], length($[3]) }' words.txt

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

A1

B3

C2

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using $2 instead of $1 prints wrong fields.

Using 4 instead of 3 changes the filter condition.

We check the length of the first field ($1) to be greater than 3, then print the word ($1) and its length.