On Tue, 28 Aug 2012 14:44:40 EDT erik quanstrom <[email protected]> wrote:
> >=20
> > switch/case would make helluva difference over nested if/if not, if
> > defaulted to fall-through.
>
> maybe you have an example? because i don't see that. if not works
> fine, and can be nested. case without fallthrough is also generally
> what i want. if not, i can make the common stuff a function.
>
> > variable scoping (better than subshel) would help writing larger
> > scripts, but that's not necessarily an improvement ;-) something
> > similar to LISP's `let' special form, for dynamic binding.
>
> there is variable scoping. you can write
>
> x=3D() y=3D() cmd
>
> cmd can be a function body or whatever. x and y are then private
> to cmd. you can nest redefinitions. =20
>
> x=3D1 y=3D2 {echo first $x $y; x=3Da y=3Db {echo second $x $y; x=3D=CE=
> B1=
> y=3D=CE=B2 {echo third $x $y}; echo ret second $x $y}; echo ret first $x=
> $y}
> first 1 2
> second a b
> third =CE=B1 =CE=B2
> ret second a b
> ret first 1 2
This is basically the same as let. Instead of
let x=1 y=2 foo
you say
x=1 y=2 foo
and this is lexical scoping. try
lex=1 { echo $lex; }
echo $lex
vs
{ var=1; echo $var; }
echo $var
