Signals
 | When you issue the kill command and process number, you are also sending a signal associated with the kill. We did not specify a signal in our kill example; however, the default signal of 15, or SIGTERM, was used. These signals are used by the system to communicate with processes. The signal of 15 we used to terminate our process is a software termination signal that is usually enough to terminate a user process such as the find we had started. A process that is difficult to kill may require the SIGKILL, or 9 signal. This signal causes an immediate termination of the process. I use this only as a last resort because processes killed with ... |
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