exec and dead children

Karl Auer kauer at biplane.com.au
Fri Dec 4 09:07:33 UTC 2015


On Fri, 2015-12-04 at 08:46 +0100, Nils Kassube wrote:
> Nils Kassube wrote:
> Sorry, forget about the "wait" command - it doesn't work.

Yes, I know, I was tactfully ignoring that advice :-)

> However there is a way that does work:
> #!/bin/sh
> firefox $ARGS <&- >&- 2>- &

Well, that's new to me, I have not seen that syntax before. However, it
doesn't work for me.

With or without nohup, whether redirecting as you suggest or redirecting
to a file or redirecting to /dev/null, I still need a delay or
everything dies. Without nohup everything dies anyway.

without nohup, with standard redirections, no delay
   - everything dies when script finishes

with nohup, with standard redirections, no delay
   - everything dies when script finishes

without nohup, with standard redirections, with delay
   - everything dies when script finishes

with nohup, with standard redirections, with delay
   - everything OK

without nohup, with your redirections, no delay
   - everything dies

with nohup, with your redirections, no delay
   - everything dies

without nohup, with your redirections, with delay
   - everything dies

with nohup, with your redirections, with delay
   - everything OK

Here is my working script (except that the firefoxcommand is all on one
line)

   #!/bin/sh
   nohup /usr/bin/firefox \
        -new-window URL1 \
        -new-window URL2 \
        > /dev/null 2>&1 &
   /bin/sleep 20

Did you perhaps have a firefox window already open when you exec-ed your
script? If you did, it will work - with or without nohup, and with or
without a delay.

I also found that firefox would sometimes not start at all when I used
your redirections - not always, but every now and then I would have to
start it in safe mode.

Regards, K.


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Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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