set -e for exit on error in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to make the script exit immediately if any command fails.

Bash Scripting

#!/bin/bash
[1]
echo "Start script"
false
echo "This will not print if exit on error is set"

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

Aset -e

Bexit 1

Cset +e

Dtrap 'exit' ERR

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set +e' which disables exit on error.

Using 'exit 1' without condition, which exits immediately.

Using 'trap' incorrectly without understanding its purpose.

Using 'set -e' makes the script stop running if any command returns an error.

2fill in blank

medium

Complete the code to enable exit on error and print a message before exiting.

Bash Scripting

#!/bin/bash
set -e
trap 'echo "Error occurred, exiting."' [1]
echo "Running script"
false
echo "This will not print"

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

AEXIT

BERR

CTERM

DINT

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'EXIT' which triggers on any exit, not just errors.

Using 'INT' or 'TERM' which are signals for interrupts or termination.

The 'ERR' trap runs when a command fails, allowing a message before exit.

3fill in blank

hard

Fix the error in the script to ensure it exits on any command failure.

Bash Scripting

#!/bin/bash
[1]
echo "Start"
false
echo "End"

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

Aset +e

Bset -x

Cset -e

Dset -u

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set +e' which disables exit on error.

Using 'set -u' which treats unset variables as errors but doesn't exit on command failure.

'set -e' ensures the script exits immediately on any command failure.

4fill in blank

hard

Fill both blanks to create a script that exits on error and prints a custom message on failure.

Bash Scripting

#!/bin/bash
[1]
trap '[2] "Script failed."' ERR
echo "Running"
false
echo "Done"

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

Aset -e

Becho

Cexit

Dset +e

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set +e' disables exit on error.

Using 'exit' in trap without message.

Using wrong commands in trap.

'set -e' enables exit on error, and 'echo' prints the message when trap triggers.

5fill in blank

hard

Fill all three blanks to create a script that exits on error, prints a message on error, and disables exit on error after a command.

Bash Scripting

#!/bin/bash
[1]
trap '[2] "Error detected."' ERR
echo "Start"
set [3]
false
echo "This will print because exit on error is disabled"

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

Aset -e

Becho

C-x

D+e

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set +e' too early disables exit on error.

Using wrong trap commands.

Confusing '+e' and '-e' options.

'set -e' enables exit on error, 'echo' prints the message on error, and 'set +e' disables exit on error.