Perl "quote words" operator. Whitespace-separated words enclosed between the delimiters are quoted and returned as a list. So qw/a b c d/ is a streamlined way of saying ('a','b','c','d').

As with all other q* quoting operators, you get to pick your own delimiters, so qw(foo bar baz quux) also works.

Important note!

A common error is to try to use commas to separate the items inside qw//. Since it splits on whitespace, this gives totally unexpected results! perl -w will warn about this.

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