Public SourceMage Discussion List

[Andrew <afrayedknot AT thefrayedknot.armory.com>]

On Tue, Apr 04, 2006 at 08:18:34PM +0300, Juuso Alasuutari wrote:
> > > function is_kernel_minimum() {
> > >   local MIN CUR a b n=1
> > >   MIN=`expr $1 : '\(^[^-]*\)'`
> > >   MIN=${MIN//\./\ }
> > >   CUR=`get_kernel_version`
> > >   CUR=`expr $CUR : '\(^[^-]*\)'`
> > >   CUR=${CUR//\./\ }
> > >   for a in $MIN; do
> > >     b=`echo $CUR | cut -d" " -f$n`
> > >     if (( a < b )); then
> > >       return 0
> > >     elif (( a > b )); then
> > >       return 1
> > >     fi
> > >     (( n += 1 ))
> > >   done
> > > }
> >
> > I haven't vetted this entirely, but what first caught my attention was
> > the VAR=`command` assignments. I may be wrong, but I believe
> > VAR=$(command) is the preferred method.
> >
> > -sandalle
> 
> Alright. What difference do `` and $() have all in all?
> 

They are functionally equivalent; they both execute the command and
evaluate to the command's stdout. However it is possible to nest $() but
not ``. I also find $() a bit easier to distinguish in the code than ``
(although thats more style/opinion). In sorcery I always prefer $() to
`` for that reason.

-Andrew

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