On Wed, Mar 26, 2008 at 3:55 PM, Walter J. Mack <
wmack@componentsw.com> wrote:
> I remember on some systems that a "background" job would continue to run after logout, but only if it didn't try to output anything to stdin or stderr anymore (I believe that was true on AIX).
>
> The trick to get around that was to say
>
> command >&/dev/null&
>
> Walter
>
>
> Matt Graham wrote:
> After a long battle with technology, Joshua Zeidner wrote:
>
>
> On Wed, Mar 26, 2008 at 2:01 PM, Nathan <nathan@paysonlinux.org> wrote:
>
>
> On Wednesday 26 March 2008 13:59:59 Joshua Zeidner wrote:
>
>
> Is there an easy way to create a daemon without creating an init.d
> script, etc.?
>
> what I do is ssh into whichever box it is, even the local machine, and
> run the command with an & at the end, then exit. From there I can do
> whatever I want, except reboot and it will continue running.
>
> well the system I'm using appears to terminate a background (&)
> process when the user is logged out.
> The shell sends HUP to all its children when the shell exits. Hence nohup.
>
>
> I always thought that background processes are still children of the shell
> process, and thus terminating the shell will kill the &'d process, but I
> could be wrong on that one. I'm not sure if this is the default, or just
> how this Debian system was set up.
>
> Debian? Look into the start-stop-daemon program. That's a fairly simple way
> to make something that wasn't originally intended to be a daemon act somewhat
> like a daemon. I used this to run a couple of useful persistent scripts at
> boot time on a Debian box.
>
>
> Everything else on this server is super bolted down- so I would be surprised
> if [it's] not default.
>
> HUPping all children of the shell is standard behavior, not anything "super
> bolted down".
>
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I think there was a presentation on this topic,
at one of those "developer" meetings (held at Adtron in Tempe)
some time between Sept. 2006 and May 2007.
...it included stuff about how the program / script could "fork"
itself and switch user IDs to no longer be associated with the
person who entered the command to cause it to start.
Someone else who understands [bash, and] this stuff
"better than I do" might chime in at this point; especially
if the notes from that presentation are available on the web
or something.
...actually, maybe I don't understand they key part --
the part about << "without creating an init.d script, etc.?" >>.
--
Mike Schwartz
Glendale AZ
schwartz@acm.org
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