An excess of caution would suggest adding a defined test to the while-loop conditional. This test is not added by default by the compiler in the case of a complex conditional expression like the do-block:
    while ( defined($_ = do { ... }) ) { ... }

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Read and Create File by AnomalousMonk
in thread Read and Create File by szpt9m

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