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A signal in Unix is an asynchronous notification sent to a process to notify it of an event, such as an interrupt or termination request. Common signals include:
• SIGINT: Interrupt signal (usually sent by pressing Ctrl+C).
• SIGTERM: Termination signal, which can be caught and handled.
• SIGKILL: Forces a process to terminate immediately and cannot be caught.
Signals can be handled using signal handlers in shell scripts or programming languages like C.
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