/usr/share/gmt/x2sys/geoz.def is in gmt 4.5.12-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # $Id: geoz.def 9545 2011-07-27 19:31:54Z pwessel $
#
# Define file for X2SYS processing of ASCII lon,lat,z files
#
# This file applies to plain 3-column ASCII files.
#
#---------------------------------------------------------------------
#ASCII # The input file is ASCII
#SKIP 1 # The number of header records to skip
#---------------------------------------------------------------------
#name intype NaN-proxy? NaN-proxy scale offset oformat
lon a N 0 1 0 %10.5f
lat a N 0 1 0 %9.5f
z a N 0 1 0 %6.1f
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