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Re: Starting background process in ssh session



On Thu, Sep 01, 2005 at 09:09:54PM -0500, Greg Norris wrote:
> On Thu, Sep 01, 2005 at 05:33:28PM -0400, Roberto C. Sanchez wrote:
> > I occasionally log into a machine remotely and start a process in the
> > background:
> > 
> > command &
> > 
> > However, when I log out of the machine, the ssh process on my local
> > machine blocks.  I guess that it is becuase the remote still has jobs
> > running.  Is there a way to get it start the process in the background
> > and then detach from the shell?  I have already tried this:
> 
> This is often caused because the process still has a file descriptor (FD)
> referencing the tty.  Ssh doesn't like to terminate when this occurs,
> because there's a chance that the FD could still be required.  If this 
> is the case, then you probably just need to redirect the usual 
> suspects... stdin, stdout, and/or stderr.  Something like:
> 
>    $ command </dev/null >&0 2>&0 &
> 
> It may not be necessary to redirect all of them, but that will probably 
> require some experimentation to determine.  You may want to consider 
> running your command under "nohup" as well, to protect it from the loss 
> of your session.

OK.  I should have been more precise in my explanation then.  I am
redirecting like this:

command >log.txt 2>&1 &

Is that causing it then?

-Roberto

-- 
Roberto C. Sanchez
http://familiasanchez.net/~roberto

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