Re: nohup feature request / Please fwd to Jim Meyering

[Phillip Susi]

Bob Proulx wrote:
> NOT this:
>
>   $* >>nohup.out.$name-$pid
>
> But this:
>
>   $* | sed "s/^/$name-$pid: /" >> nohup.out
>   $* | sed "s/^/$timestamp: /" >> nohup.out

OH!  I see now... yea, that would require active participation.

>   trap "" 1 15
>   if test -t 2>&1  ; then
>         echo "Sending output to 'nohup.out'"
>         exec nice -5 $* >>nohup.out 2>&1
>   else
>         exec nice -5 $* 2>&1
>   fi
>
> All that nohup does is to ignore SIGHUP and SIGTERM and redirect the
> output if it is not already redirected.  Before job control this was
> all that was needed to avoid a controlling terminal disconnection from
> killing the process.  Unfortunately with job control a little more is
> needed.

Trapping the signals in the shell does not trap them in the exec'd child 
program, so I don't see how this would work.