Why error handling prevents silent failures in Bash Scripting - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to stop the script if a command fails.

Bash Scripting

set [1]

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

A-x

B-e

C-u

D-v

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set -x' which only prints commands but doesn't stop on errors.

Forgetting to use any option, so errors are ignored.

Using 'set -e' makes the script exit immediately if any command returns a non-zero status, preventing silent failures.

2fill in blank

medium

Complete the code to check if the last command failed and print an error message.

Bash Scripting

if [[ [1] -ne 0 ]]; then echo "Error occurred"; fi

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

A$!

B$#

C$?

D$$

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$#' which counts script arguments, not exit status.

Using '$$' which is the process ID, not exit status.

The special variable $? holds the exit status of the last command; non-zero means failure.

3fill in blank

hard

Fix the error in the code to correctly handle command failure.

Bash Scripting

command_that_might_fail
if [ [1] ]; then echo "Failed"; fi

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

A$? -ne 0

B$? == 0

C$? == 1

D$? -eq 0

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for success instead of failure.

Using '==' inside single brackets which is invalid.

To detect failure, check if $? is not equal to 0 using '-ne 0'.

4fill in blank

hard

Fill both blanks to run a command and exit if it fails.

Bash Scripting

[1] || [2]

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

Acommand_that_might_fail

Bexit 1

Cecho 'Error detected'

Dcontinue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'continue' which is invalid outside loops.

Not exiting on failure, so errors are ignored.

The '||' operator runs the right command if the left fails; here, exit 1 stops the script on failure.

5fill in blank

hard

Fill all three blanks to create a function that runs a command and handles errors.

Bash Scripting

run_command() {
  [1]
  if [[ [2] -ne 0 ]]; then
    [3]
  fi
}

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

Acommand "$@"

B$?

Cecho 'Command failed' && exit 1

Dreturn 0

Attempts:

3 left

💡 Hint

Common Mistakes

Not passing arguments to the command.

Not checking exit status properly.

Not exiting on failure.

The function runs the command with arguments, checks exit status, and exits with error message if failed.