Le decadi 20 fructidor, an CCXXIV, Charlie Kravetz a écrit : > I open a second terminal, then use ps -A to find the command. I can > kill it with "sudo kill ????" which kills the job number. It is not > always instant, but faster than ctrl-c for some things, including rsync > and cp .
Not true. The only difference between your method and kill is that kill will send SIGTERM (number 15) by default while Ctrl-C sends SIGINT (number 3) by default. But both have the same default action of interrupting the process. cp does not handle signals explicitly, leaving them to their default behaviour. rsync catches signals, but with the same handler for SIGINT and SIGTERM. Therefore, the effect of Ctrl-C and kill on both is exactly the same. The difference you observe is certainly only psychological. Note that the same does not apply to "kill -9": SIGKILL, number 9, can not be caught by processes. Yet, since cp does not catch signals, Ctrl-C, kill or kill -9 will have the same effect. On rsync, "kill -9" will prevent it from cleaning up temp files, which can be a life saver if you forgot the -P option and already copied a big chunk of data over a slow link. Also note that other applications may behave differently. I have noticed that Python applications using Qt ignore SIGINT for no apparent reason except annoy developers. Knowing ^\, i.e. SIGQUIT, is useful in that kind of cases, even though this is not the purpose of SIGQUIT. Regards, -- Nicolas George
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