This file is indexed.

/etc/gnuastro.conf is in gnuastro 0.5-1.

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

The actual contents of the file can be viewed below.

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# Default values for the common options to all the programs in GNU
# Astronomy Utitlies.
#
# Use the long option name of each paramter followed by
# a value. The name and value should be separated by
# atleast one of the following charaacters:
# space, `,`, `=` or `:`
#
# Run with `--help` option or read the manual for a full
# explanation of what each option means.
#
# NOTE I:  All counting is from zero, not one.
# NOTE II: Lines starting with `#` are ignored.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.  This file is offered as-is,
# without any warranty.

# Input:
 hdu              1
 ignorecase       1
 searchin         name

# Tessellation
 tilesize         50,50
 numchannels      1,1
 remainderfrac    0.1
 workoverch       0
 interpnumngb     9
 interponlyblank  0

# Output:
 tableformat      fits-binary

# Operating mode
 minmapsize       1000000000