This file is indexed.

/usr/share/idzebra-2.0/tab/usmarc.flt is in idzebra-2.0-common 2.0.59-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Rather dummy input-filter for MARC
#

BEGIN			     { begin record usmarc }
/^00./ / / BODY /\n/         {
                                begin element $0
				data -element @ $2
				end element
                             }
/^.../ / / /../              { begin element $0 }
/[$*]/ /./ / / BODY / *[$*\n]/  { data -element $1 $3; unread 4 }
/\n/                         { end element }

/./                          { }