Could somebody please explain what this line does? $x<<3

[Angerstein]

I have a Line of code I just donīt know waht it does.
Especialy the underlined section:

All used vars are scalars.

my $d = (($facility_i<<3)|($priority_i));
          --------------

Its from Net::Syslog syslog.pm line 93.

Thanks
Bastian



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