<> means readline(ARGV)<IDENTIFIER> means readline(IDENTIFIER)<$IDENTIFIER> means readline($IDENTIFIER)<...> (anything else) means glob(qq<...>)
So <*> means glob(qq<*>) or glob('*') .
glob used to create multiple lines or file names from a template.
In the context of the <*> list, aka glob('*') returns all files in the current working directory other than those whose name begins with . .
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