Signal handling with trap in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to catch the SIGINT signal and run the cleanup function.

Bash Scripting

trap cleanup [1]

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

ASIGKILL

BSIGINT

CSIGTERM

DSIGSTOP

Attempts:

3 left

💡 Hint

Common Mistakes

Using SIGKILL or SIGSTOP which cannot be trapped.

Confusing SIGTERM with SIGINT.

The trap command catches signals. SIGINT is the interrupt signal sent by Ctrl+C.

2fill in blank

medium

Complete the code to ignore the SIGTERM signal.

Bash Scripting

trap '' [1]

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

ASIGTERM

BSIGHUP

CSIGQUIT

DSIGINT

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to ignore SIGINT instead of SIGTERM.

Using an invalid signal name.

Using trap '' SIGTERM tells the script to ignore the termination signal.

3fill in blank

hard

Fix the error in the trap command to correctly catch SIGQUIT and run the quit_handler function.

Bash Scripting

trap [1] SIGQUIT

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

Aquit_handler;

Bquit_handler &

Cquit_handler()

Dquit_handler

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses after the function name.

Adding extra characters like '&' or ';' after the function name.

The trap command expects the function name without parentheses or extra characters.

4fill in blank

hard

Fill both blanks to run cleanup on SIGINT and SIGTERM signals.

Bash Scripting

trap cleanup [1] [2]

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

ASIGINT

BSIGTERM

CSIGKILL

DSIGSTOP

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to trap SIGKILL or SIGSTOP which cannot be caught.

Using wrong signal names.

Both SIGINT and SIGTERM are common signals to stop a script. Trap them to run cleanup.

5fill in blank

hard

Fill all three blanks to create a trap that runs handle_exit on EXIT and SIGINT.

Bash Scripting

trap [1] [2] [3]

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

Ahandle_exit

BEXIT

CSIGINT

DSIGTERM

Attempts:

3 left

💡 Hint

Common Mistakes

Putting signals before the function name.

Using parentheses with the function name.

The trap command syntax is: trap function signal1 signal2 .... Here, handle_exit runs on EXIT and SIGINT.