and finished typing the banner text. You want the cat process to close its standard input so it can write the file and return you to the Bash prompt-without sending a terminating or suspending signal to the process. Which keystroke should you press?
cat keeps reading from standard input until it receives an end-of-file (EOF) condition. Pressing Ctrl+D at the start of a new line causes the terminal driver to generate the ASCII EOT character, which the shell passes to cat. When cat reads zero bytes it interprets this as EOF, flushes its buffer, closes the file descriptor, and exits normally; the shell session continues.
Ctrl+C instead sends SIGINT, immediately interrupting and terminating the foreground process. Ctrl+Z sends SIGTSTP, suspending the process and leaving the file open but incomplete until it is resumed. Ctrl+\ sends SIGQUIT, which terminates the process and can create a core dump. None of those meet the requirement to finish writing the file gracefully without killing or stopping the shell.
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What does Ctrl+D do in the context of standard input?
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How is Ctrl+C different from Ctrl+D when managing processes?
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What is the purpose of other signals like Ctrl+Z and Ctrl+\?
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