You get an error on the second example, because the syntax is wrong (missing ") and this is checked in the compile phase.
So your example doesn't run and thus no $@.

The next example dies because system() returns the exit-code of the command it runs.
Unix commands return 0 on success, which is false for Perl, hence it dies.

Update: fixed typos

In reply to Re: Eval and system() by busunsl
in thread Eval and system() by camelman

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