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What is the default signal that is generated when sending a kill command to a process in Linux?
kill ends a process by sending it a signal. The default signal is SIGTERM. kill is a built-in shell command.
Which signals can be used to notify the process to exit gracefully?
The arrival of a SIGXCPU signal provides the receiving process a chance to quickly save any intermediate results and to exit gracefully, before it is terminated by the operating system using the SIGKILL signal. The SIGXFSZ signal is sent to a process when it grows a file that exceeds the maximum allowed size.
What is signal sent to running programs / scripts on?
While on shutdown the running processes are first told to stop by init (from sendsigs on old implementations, according to @JdeBP)/systemd. The remaining processes, if any, are sent a SIGTERM. The ones that ignore SIGTERM or do not finish on time, are shortly thereafter sent a SIGKILL by init/systemd.
How to run script with systemd right before shutdown in Linux?
Using this systemd unit file you can run either some command or script as a last service before shutdown in Linux. Now ideally any systemd service gets called via ExecStop at shutdown stage and with ExecStart at boot up stage. But here our requirement is little different, we wish to run script with systemd right before shutdown stage.
How to shut down windows from the command line?
You can shut down from the command line — so your script could be fairly simple: You can run a batch file that calls your program, check out the discussion here for how to do it: http://www.pcworld.com/article/115628/windows_tips_make_windows_start_and_stop_the_way_you_want.html
Where can I find a startup / shutdown script?
In addition to Dan Williams’ answer, if you want to add a Startup/Shutdown script, you need to be looking for Windows Settings under Computer Configuration. If you want to add a Logon/Logoff script, you need to be looking for Windows Settings under User Configuration.