Why file I/O is core to scripting in Bash Scripting - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read the contents of a file named 'data.txt' and display it.

Bash Scripting

cat [1]

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

Aoutput.txt

Binput.txt

Cfile.txt

Ddata.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong file name.

Forgetting to specify the file name after 'cat'.

The cat command reads and displays the contents of the specified file. Here, we want to read 'data.txt'.

2fill in blank

medium

Complete the code to write the text 'Hello World' into a file named 'greeting.txt'.

Bash Scripting

echo "Hello World" > [1]

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

Agreeting.txt

Boutput.txt

Chello.txt

Dmessage.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong file name.

Using the append operator >> instead of overwrite >.

The echo command outputs text. Using > redirects this output into the specified file. Here, we want to write into 'greeting.txt'.

3fill in blank

hard

Fix the error in the code to append the text 'New line' to the file 'log.txt'.

Bash Scripting

echo "New line" [1] log.txt

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

A|

B>

C>>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using > which overwrites the file.

Using input redirection < or pipe | incorrectly.

The >> operator appends text to a file without overwriting existing content. Using > would overwrite the file.

4fill in blank

hard

Fill both blanks to create a script that reads 'input.txt', filters lines containing 'error', and writes them to 'errors.log'.

Bash Scripting

grep [1] [2] > errors.log

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

A"error"

Binput.txt

Coutput.txt

D"warning"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong pattern or file name.

Confusing input and output files.

The grep command searches for a pattern in a file. Here, we search for the word 'error' in 'input.txt' and redirect the matching lines to 'errors.log'.

5fill in blank

hard

Fill all three blanks to create a script that counts lines in 'data.csv' containing the word 'success' and saves the count to 'count.txt'.

Bash Scripting

grep [1] [2] | wc -l > [3]

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

A"success"

Bdata.csv

Ccount.txt

Derrors.log

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong file names.

Forgetting to redirect output to the count file.

This command searches for 'success' in 'data.csv', counts the matching lines with wc -l, and writes the count to 'count.txt'.