signal handling with trap

[Andy Bair]

>   Runlevles are collections of services.  Each runlevel gets a number.
>  Debian systems use runlevel 2 almost exclusively.  Other
> distributions use different runlevels.  Red Hat and derivatives, in
> particular, use runlevel 3 for normal operation without an XDM
> (graphical login), and runlevel 5 for normal operation including an
> XDM.  On pretty much all systems, runlevel 0 is used for  "shutdown
> and halt", 6 for "shutdown and reboot", and for "single-user mode".

  and halt", 6 for "shutdown and reboot", and 1 for "single-user mode".

Andy

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