If you just print an array (as in print @_) there will be nothing to show where each element starts and ends: 

$ perl -e '@_ = qw{a bcd ef}; print @_'
abcdef

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If you put the array in interpolating quotes, you will see each element separated by the value of the special variable $" (which, by default, is a space): 

$ perl -e '@_ = qw{a bcd ef}; print "@_"'
a bcd ef

$ perl -e '@_ = qw{a bcd ef}; print qq{@_}'
a bcd ef

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In rare situations, perhaps where $" was changed elsewhere in the code, you may want to make a localised change to $" (typically within an anonymous block). See local, "Temporary Values via local()" and "Localization of special variables" for more details on that. Some examples: 

$ perl -e '@_ = qw{a bcd ef}; { local $" = " "; print "@_" }'
a bcd ef

$ perl -e '@_ = qw{a bcd ef}; { local $" = "__"; print "@_" }'
a__bcd__ef

$ perl -e '@_ = qw{a bcd ef}; { local $" = "\n"; print "@_" }'
a
bcd
ef

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— Ken

In reply to Re^5: Splitting in while loop by kcott
in thread Splitting in while loop by tel2

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