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hash ( [FILEHANDLE_GLOB_REF],[ BYTES_PER_HASH_MARK] )
    Called without parameters, or with the first argument false, hash 
+marks are suppressed. If the first argument is true but not a referen
+ce to a file handle glob, then \*STDERR is used. The second argument 
+is the number of bytes per hash mark printed, and defaults to 1024. I
+n all cases the return value is a reference to an array of two: the f
+ilehandle glob reference and the bytes per hash mark.