Hi,

I`m loggin into a remote site via ssh from an existing login shell.
Then I start a program using a start script.

The script contains the following start line to run the program:

nohup /opt/java/bin/java -jar httpd.jar localhost:80 2>&1 >>
standard_input_output.log &
This works - the program starts up. However, when I logout my xterm
window hangs and I do not get back to the login shell from before.

I then have to kill the xterm session completely. Why does this
behavious occurr?

I have noticed that this happens always, if your program writes to
standard output and does not redirect the output to a file - but that's
what I'm doing.

Why does my xterm session get stuck?
BTW: Am I using if and when correctly in here?

fritz-bayer@web.de wrote:
> I`m loggin into a remote site via ssh from an existing login shell.
> Then I start a program using a start script.
>
> The script contains the following start line to run the program:
>
> nohup /opt/java/bin/java -jar httpd.jar localhost:80 2>&1 >>
> standard_input_output.log &
> This works - the program starts up. However, when I logout my xterm
> window hangs and I do not get back to the login shell from before.

What you do is the following (in symbolic notation):
stderr = stdout;
stdout = fopen("standard_input_output.log", "a");

After these two operations stderr still points to the original stdout,
so your stderr writes to the terminal, resulting in the observed behaviour.

The solution is to reverse the redirections:

nohup /opt/java/bin/java -jar httpd.jar localhost:80 \
>>standard_input_output.log 2>&1 &

Yours,
Laurenz Albe

Laurenz Albe wrote:
> fritz-bayer@web.de wrote:
> > I`m loggin into a remote site via ssh from an existing login shell.
> > Then I start a program using a start script.
> >
> > The script contains the following start line to run the program:
> >
> > nohup /opt/java/bin/java -jar httpd.jar localhost:80 2>&1 >>
> > standard_input_output.log &
> > This works - the program starts up. However, when I logout my xterm
> > window hangs and I do not get back to the login shell from before.
>
> What you do is the following (in symbolic notation):
> stderr = stdout;
> stdout = fopen("standard_input_output.log", "a");
>
> After these two operations stderr still points to the original
stdout,
> so your stderr writes to the terminal, resulting in the observed
behaviour.
>
> The solution is to reverse the redirections:
>
> nohup /opt/java/bin/java -jar httpd.jar localhost:80 \
> >>standard_input_output.log 2>&1 &
>
> Yours,
> Laurenz Albe


Thanks that made it work!