/usr/share/shorewall/macro.Printer is in shorewall 5.1.12.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Shorewall -- /usr/share/shorewall/macro.Printer
#
# This macro handles Line Printer protocol printing.
#
###############################################################################
#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST RATE USER
PARAM - - tcp 515
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