在 unix 中的每個信號號都有對應的定義，決定了當進程接收到信號時的行為。下面表格中的 Action 列條目指定了每個信號的默認處置。

• Ign：Default action is to ignore the signal.
• Core：Default action is to terminate the process and dump core (see core(5)).
• Stop：Default action is to stop the process.
• Cont：Default action is to continue the process if it is currently stopped.