On 10 Jul 2003 17:17:27 -0400, parv wrote:
>
> in message <20030710030401.GA20245_at_unixcab.org>,
> wrote Mikhael Goikhman thusly...
> >
> > On 09 Jul 2003 22:40:58 -0400, parv wrote:
> > >
> > > In ~/.xinitrc, try sleeping for a while before starting aterm...
> > >
> > > xv -quit -root <image> && sleep 2
> > > aterm
> >
> > The idea is ok, but the example lines are incorrect. As it is
> > written (running xv in foreground) it wastes 2 sec for nothing.
>
> Why, sleep only if xv succeeds before starting aterm?
>
> I gathered from OP that aterm was starting before xv could do its
> thing. So there should be some reasonable wait before aterm starts.
> (See below before replying to this point.)
This is a non principal discussion, but xv does not reforks itself to
background from foreground, so if xv is finished no futher wait is ever
needed. At least "xv -quit" is transient, so this first problem is not
critical, but aterm is not, so a more important (second) problem in these
lines is a missing ampersand after aterm.
> > This would be more correct:
> >
> > (xv -quit -root <image> && aterm) &
>
> If for some reason, xv fails there would be /no/ aterm. This would
> be the least "correct" thing to do.
>
>
> > xv -quit -root <image> &
> > (sleep 3 && aterm) &
>
> I like this much better than the above two versions for above
> mentioned reasons.
>
>
> Going off topic now...
>
> I would change the last line to either of...
>
> sleep 3 && aterm &
> { sleep 3; aterm; } &
>
>
> ...Why start a sub shell, unless it is a shell specific workaround?
The subshell syntax is portable. As for the last 2 lines, different
shells do different things. The second line most certainly starts a new
shell if this syntax is supported at all. Even the first line starts a
new shell in some shells (bash, tcsh, but not zsh).
Regards,
Mikhael.
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Received on Fri Jul 11 2003 - 12:45:16 BST