Re: use sys::virt module to manage VM in kvm

[Andy Bach]

On Fri, Mar 28, 2014 at 3:05 PM, Dr.Ruud <rvtol+use...@isolution.nl> wrote:

> if ($@) {
>>      die "$@";
>> }
>>
>
> Never test $@, only use the value of $@ after a failed eval.
>

Why not?  The perldoc eval shows:
If the code to be executed doesn't vary, you may use the eval-BLOCK form to
trap
               run-time errors without incurring the penalty of recompiling
each time.  The error,
               if any, is still returned in $@.  Examples:

                   # make divide-by-zero nonfatal
                   eval { $answer = $a / $b; }; warn $@ if $@;

                   # same thing, but less efficient
                   eval '$answer = $a / $b'; warn $@ if $@;

                   # a compile-time error
                   eval { $answer = };                 # WRONG

                   # a run-time error
                   eval '$answer =';   # sets $@



-- 

a

Andy Bach,
afb...@gmail.com
608 658-1890 cell
608 261-5738 wk