Re: Question about job control in non-interactive shells
Jilles Tjoelker jil...@stack.nl wrote: On Mon, Jan 09, 2012 at 10:37:45AM -0600, Jonathan Nieder wrote: Michael Welsh Duggan wrote: I am trying to determine why: dash -c sleep 5 kill %1 results in: dash: 1: kill: No such process You are probably looking for the -m option. The cause is that the -m option (job control) enables running commands in separate process groups, and dash follows literally what POSIX says about kill %job: a background process group should be signaled; however, there is no background process group. Some shells signal one or more processes they know are part of the job in this case, but dash calls kill() on a process group that is guaranteed not to exist. Right. And you don't even need %1: dash -c sleep 5 kill $! works just fine. Cheers, -- Email: Herbert Xu herb...@gondor.apana.org.au Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line unsubscribe dash in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Question about job control in non-interactive shells
On Mon, Jan 09, 2012 at 10:37:45AM -0600, Jonathan Nieder wrote: Michael Welsh Duggan wrote: I am trying to determine why: dash -c sleep 5 kill %1 results in: dash: 1: kill: No such process You are probably looking for the -m option. The cause is that the -m option (job control) enables running commands in separate process groups, and dash follows literally what POSIX says about kill %job: a background process group should be signaled; however, there is no background process group. Some shells signal one or more processes they know are part of the job in this case, but dash calls kill() on a process group that is guaranteed not to exist. -- Jilles Tjoelker -- To unsubscribe from this list: send the line unsubscribe dash in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Question about job control in non-interactive shells
Hi Michael, Michael Welsh Duggan wrote: I am trying to determine why: dash -c sleep 5 kill %1 results in: dash: 1: kill: No such process You are probably looking for the -m option. Thanks for writing, and hope that helps, Jonathan -- To unsubscribe from this list: send the line unsubscribe dash in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
