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  supported (of those listed, only \code{SIGINT} and \code{SIGTERM}).
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  supported (of those listed, only \code{SIGINT} and \code{SIGTERM}).
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  They are much more widely used on POSIX operating systems (which
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  They are much more widely used on POSIX operating systems (which
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  should define all of those listed here), which also support a
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  should define all of those listed here), which also support a
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  \code{kill} system call to send a signal to a process, most often to
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  \code{kill} system call to send a signal to a process, most often to
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  terminate it.  Function \code{pskill} provides a wrapper: it silently
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  terminate it.  Function \code{pskill} provides a wrapper: it silently
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  ignores invalid values of its arguments, including zero or negative pids.
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  ignores invalid values of its arguments, including zero or negative
- 
 
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  \abbr{pid}s.
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  In normal use on a Unix-alike, \kbd{Ctrl-C} sends \code{SIGINT},
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  In normal use on a Unix-alike, \kbd{Ctrl-C} sends \code{SIGINT},
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  \kbd{Ctrl-\\} sends \code{SIGQUIT} and \kbd{Ctrl-Z} sends
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  \kbd{Ctrl-\\} sends \code{SIGQUIT} and \kbd{Ctrl-Z} sends
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  \code{SIGTSTP}: that and \code{SIGSTOP} suspend a process which can be
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  \code{SIGTSTP}: that and \code{SIGSTOP} suspend a process which can be
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  resumed by \code{SIGCONT}.
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  resumed by \code{SIGCONT}.