shell variable security

[Luciano Rocha]

On Wed, Oct 03, 2007 at 06:01:59PM +0000, tony.chamberlain at lemko.com wrote:
> 
> 
> I guess I was asking in general how you can be sure your variables are safe.
> Maybe it is more complicated than that? I really have just heard warnings from
> everyone, so I was taking pre-emptive measures.
> 
> I tried a few things myself too and also could not get that problem.
> 
> I tried making a file called test and doing things like
> 
>  K="$1"
>  echo $K
> 
> 
> and then calling
> 
>  test "hello\";date"
> 
> a nd
>  FIL="$1"
>  ls $FIL
> 
> but that seemed to be OK 
> 

test "hello /etc/* bye"

Is one instance where the expansion is performed (with ls & echo).

That will cause problems with things like rm, etc.


-- 
lfr
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