What is kill 9 in Linux? The kill -9 command sends a SIGKILL signal indicating to a service to shut down immediately. An unresponsive program will ignore a kill command, but it will shut down whenever a kill -9 command is issued.
What is SIGTERM Linux? SIGTERM (signal 15) is used in Unix-based operating systems, such as Linux, to terminate a process. The SIGTERM signal provides an elegant way to terminate a program, giving it the opportunity to prepare to shut down and perform cleanup tasks, or refuse to shut down under certain circumstances.
What does SIGTERM do vs SIGKILL? SIGTERM gracefully kills the process whereas SIGKILL kills the process immediately. SIGTERM signal can be handled, ignored, and blocked, but SIGKILL cannot be handled or blocked. SIGTERM doesn’t kill the child processes. SIGKILL kills the child processes as well.
What is the difference between SIGINT and SIGKILL? The default action for SIGINT, SIGTERM, SIGQUIT, and SIGKILL is to terminate the process. However, SIGTERM, SIGQUIT, and SIGKILL are defined as signals to terminate the process, but SIGINT is defined as an interruption requested by the user.