What does kill -3 mean?
59,895
Solution 1
The signals described in the original POSIX.1-1990 standard:
Signal Value Action Comment
-------------------------------------------------------------------------
SIGHUP 1 Term Hangup detected on controlling terminal
or death of controlling process
SIGINT 2 Term Interrupt from keyboard
SIGQUIT 3 Core Quit from keyboard
SIGILL 4 Core Illegal Instruction
SIGABRT 6 Core Abort signal from abort(3)
SIGFPE 8 Core Floating point exception
SIGKILL 9 Term Kill signal
SIGSEGV 11 Core Invalid memory reference
SIGPIPE 13 Term Broken pipe: write to pipe with no readers
SIGALRM 14 Term Timer signal from alarm(2)
SIGTERM 15 Term Termination signal
SIGUSR1 30,10,16 Term User-defined signal 1
SIGUSR2 31,12,17 Term User-defined signal 2
SIGCHLD 20,17,18 Ign Child stopped or terminated
SIGCONT 19,18,25 Cont Continue if stopped
SIGSTOP 17,19,23 Stop Stop process
SIGTSTP 18,20,24 Stop Stop typed at tty
SIGTTIN 21,21,26 Stop tty input for background process
SIGTTOU 22,22,27 Stop tty output for background process
Solution 2
kill -3 is a thread dump that will list all the Java threads that are currently active in Java Virtual Machine (JVM).
Solution 3
kill -l
shows us all signals. Following this hint 3 means SIGQUIT
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Author by
user705414
Updated on September 18, 2022Comments
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user705414 over 1 year
I know what
kill -9
means, but anyone can explain what doeskill -3
mean? Is there any special signal it sends out?-
Tamara Wijsman over 12 yearsHave you tried
man kill
? -
Coenni almost 11 years@TomWijsman, man kill doesn't list the signals and man signals doesn't show anything at all. This is actually the first useful thin that comes up with you search google for "kill -3". :) It is really easy to over look the 'kill -l' option, especially if you didn't know much about signals ahead of time.
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Tamara Wijsman almost 11 years@Ape-inago: It is short enough to not skip over an option, but granted clarifying what to look for helps, thanks;
kill -l
indeed lists a summary, if you were wonderingman 7 signal
does list them in detail. It is where the table in the currently accepted answer likely comes from.
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user1686 over 12 yearsUnfortunately, the numeric values of these signals vary between operating systems and even between architectures.
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Gustave almost 5 years
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theprogrammer almost 3 yearsWhat's the equivalent of this on windows? On windows it says
kill is not a recognized command