Sheldon Hearn wrote:
>
> On Mon, 12 Jul 1999 18:37:13 GMT, Niall Smart wrote:
>
> > The patch appended seems to fix this, I'd like someone familiar
> > with sh to review it though, since this may be symptomatic of
> > a general problem with command substitution.
>
> As I understand your patch, you're saying "we should fork off a child
> process when the command in question is cd"? This is what I missed when
> I tried ``echo .`sleep 600`.'' and assumed that the result was proof
> that we always spawn a subprocess for backtick evaluation. :-(
As I understand it most builtins will not spawn a new shell
when they are used in command substitution:
niall% echo `echo $$` $$
20354 20354
niall%
Niall
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