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The null filehandle <> is special and can be used to emulate the behav
+-
ior of sed and awk.  Input from <> comes either from standard input, o
+r
...
ARGV and put the current filename into variable  ARGV.   It  also  use
+s
filehandle  ARGV  internally.  You can modify @ARGV before the first <
+>
as long as you leave the first filename at the beginning of the  array
+.