Re: [Help-bash] Unexpected behaviour in job control inside subshell environment

[Chris F.A. Johnson]

On Thu, 1 Dec 2016, Greg Wooledge wrote:

> On Thu, Dec 01, 2016 at 12:55:04PM -0300, Diego Augusto Molina wrote:
> > So I came up with the following idea:
> >
> > SLEEP_ARG=wrong-value;
> > (
> >   sleep "10${SLEEP_ARG}" &
> >   sleep 0.1; # Optional but recommended
> >   jobs -r 1;
>
> Remember that job control is disabled in scripts (non-interactive shells)
> by default.
>
> As far as wrapping the sleep(1) command to validate arguments, I would
> go with something more like this:
>
> ver=$(sleep --version 2>&1)

$ ver=$(sleep --version 2>&1)
$ echo "$ver"
sleep: usage: sleep seconds[.fraction]


--
Chris F.A. Johnson, <http://cfajohnson.com>