http://www.perlmonks.org?node_id=1037732


in reply to Space prepended to Array Print

perlvar 
$LIST_SEPARATOR
$"

When an array or an array slice is interpolated into a double-quoted s
+tring or a similar context
such as /.../ , its elements are separated by this value. Default is a
+ space.

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In Section Seekers of Perl Wisdom