S<signal><pid>Send<sig> to <pid>.<sig> can be specified either as a number or
as a name (for example, HUP).The default signal starts out as TERM.Each time a signal is successfully sent, the default signal is updated
to be that signal.<pid> is a process id.
htop
。我发现每台机器之间的信息更加一致。可通过MacPorts使用。