trap for cleanup on exit in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run the cleanup function when the script exits.

Bash Scripting

trap [1] EXIT

cleanup() {
  echo "Cleaning up..."
}

cleanup

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

Asignal

Bexit

Ctrap

Dcleanup

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exit' instead of the function name in trap.

Adding parentheses after the function name in trap.

Using 'signal' which is not a command here.

The trap command runs the specified function or command when the script receives the EXIT signal. Here, 'cleanup' is the function to run.

2fill in blank

medium

Complete the code to trap both EXIT and INT signals to run cleanup.

Bash Scripting

trap [1] EXIT INT

cleanup() {
  echo "Cleaning up resources..."
}

cleanup

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

AINT

Bcleanup()

Ccleanup

Dexit

Attempts:

3 left

💡 Hint

Common Mistakes

Including parentheses after the function name in trap.

Using signal names as the command to run.

Forgetting to list all signals after the command.

The trap command takes the function name without parentheses to run on specified signals like EXIT and INT (Ctrl+C).

3fill in blank

hard

Fix the error in the trap command to correctly call cleanup on script exit.

Bash Scripting

trap [1] EXIT

cleanup() {
  echo "Done cleaning."
}

cleanup

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

Acleanup()

Bcleanup

C"cleanup"

D'cleanup()'

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses after the function name in trap.

Using quotes around the function name.

Using the wrong command name.

In trap, the function name should be given without parentheses or quotes to run correctly on exit.

4fill in blank

hard

Fill both blanks to create a trap that runs cleanup on EXIT and TERM signals.

Bash Scripting

trap [1] [2]

cleanup() {
  echo "Cleanup done."
}

cleanup

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

Acleanup

BEXIT

CTERM

DB C

Attempts:

3 left

💡 Hint

Common Mistakes

Putting signals before the command.

Using wrong signal names.

Adding parentheses to the function name.

The trap command syntax is: trap command signals. Here, 'cleanup' is the command, and 'EXIT TERM' are the signals.

5fill in blank

hard

Fill all three blanks to trap cleanup on EXIT and INT signals and define the cleanup function.

Bash Scripting

trap [1] [2]

[3]() {
  echo "Exiting and cleaning up."
}

cleanup

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

Acleanup

BEXIT INT

Dexit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exit' instead of 'cleanup' as the function name.

Not listing both signals.

Adding parentheses to the function name.

The trap command runs 'cleanup' on signals 'EXIT INT'. The function named 'cleanup' is defined to run the cleanup code.