Re^5: not able to make defined-or operator work in my code

I have not included that in the code, however, when i do a export hi='' i'd expect the code to display 'undefined value' against the key hi.But it doesn't not sure why.

Comment on Re^5: not able to make defined-or operator work in my code

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Re^6: not able to make defined-or operator work in my code by Anonymous Monk on Feb 11, 2015 at 01:52 UTC
But `export hi=''` is an empty string, and in Perl, there is a difference between an empty string and `undef` (the latter can be thought of as the absence of a value, kind of like `NULL` in other languages). Defined-or tests for `undef`, hence the above recommendation to test with length. Did you try looking at %ENV with Data::Dump or Data::Dumper, as was recommended above?	[reply] [d/l] [select]