C:\Users\pmu\Documents\perl\work>perl hostnames.pl test_list_logins.txt

Deleting existing "hostlist_hostnames.pl_000190101234.txt". A new one will be created.

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Please Check the file - [ C:\Users\pmu\Documents\perl\work\hostlist_hostnames.pl_000190101234.txt ].
NULLs are replaced with corresponding pWWNs.
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C:\Users\pmu\Documents\perl\work