Catching SIGINT signal to terminate a custom shell

Question

Hope you can help me to resolve this problem.

For school I have to transform Ctrl+C to a command which doesn\'t shut down the shell, but he reminds through

Answer 1

As you're talking about doing it from the shell, you probably want:

$ trap "echo Please type \'exit\' to close the shell." SIGINT

Please type 'exit' to close the shell.
$

This specifies a command to execute when the listed signal is trapped (the trap command can also trap other signals; SIGINT is the one generated by Ctrl-C). The \' protects the quote from being interpreted by the shell.