The problem is that you used the following grep: 

grep((0 + $_) >= 99999999)

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You meant to use the following grep: 

grep(((0 + $_) >= 99999999), @times)

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Be careful when you omit parens around arguments.

You must have had different code on your linux system. Side-effects aside, 

if (EXPR, @times) { ... }

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is the same thing as 
if (@times) { ... }

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on all platforms.

Note that 

grep(EXPR)

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was a syntax error before 5.18. In 5.18, it was changed to be equivalent to 
grep(EXPR, @empty)

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The mentions of a syntax error by the other posters is not relevant to the question; they're simply using an older version of Perl than the versions present on each of your systems.

In reply to Re: compare always true in grep by ikegami
in thread compare always true in grep by RonW

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