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signum   signame   Name            Description
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0     SIGNULL   Null            Check access to pid
1     SIGHUP    Hangup          Terminate; can be trapped
2     SIGINT    Interrupt       Terminate; can be trapped
3     SIGQUIT   Quit            Terminate with core dump; can be trapped
9     SIGKILL   Kill            Forced termination; cannot be trapped
15     SIGTERM   Terminate       Terminate; can be trapped
24     SIGSTOP   Stop            Pause the process; cannot be trapped
25     SIGTSTP   Terminal stop   Pause the process; can be trapped
26     SIGCONT   Continue        Run a stopped process

SIGNULL (0), the null signal, invokes error checking but no signal is
actually sent.  This can be used to test the validity or existence of pid.

SIGTERM (15), the (default) terminate signal, can be trapped by the
receiving process, allowing the receiver to execute an orderly
shutdown or to ignore the signal entirely.  For orderly operations,
this is the perferred choice.

SIGKILL (9), the kill signal, forces a process to terminate
immediately.  Since SIGKILL cannot be trapped or ignored, it is useful
for terminating a process that does not respond to SIGTERM.
The receiving process must belong to the user of the sending process,
unless the user has appropriate privileges.
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Hewlett-Packard Company            - 2 -    HP-UX Release 10.20:  July 1996
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