Signal sigterm, sigkill, and SIGINT related to Process Termination in Linux

1. sigterm

"Kill PID" sends sigterm to the process PID.

This is the termination signal sent by killcommand by default.

2. SIGINT

Hitting the interrupt key (delete or Ctrl + C) in the terminal generates a SIGINT signal. This signal will be sent to the process (inforeground process group ). When we want to stop a runawayProgram(Runaway program), you can send this signal. Used to end the foreground process.

3. sigkill

"Kill-9 PID" will send sigkill to the process PID.

In addition, this signal cannot be captured by the process. Used to force the process PID to end.