s/xyz456/$genpass[0]/;

[download]

means 

$_ =~ s/xyz456/$genpass[0]/;

[download]

You checked whether $genpass[0] was undef or not, but you didn't check $_.

In reply to Re: Why do I get uninitialized value in substitution (s///) in my array? by ikegami
in thread Why do I get uninitialized value in substitution (s///) in my array? by xjlittle

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