This file is indexed.

/usr/bin/gfs2gfs is in gerris 20131206+dfsg-7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

usage()
{
	cat <<EOF
Usage: gfs2gfs [OPTIONS] < OLDFILE > NEWFILE

Converts old Gerris simulation files to the current format.

Options:
        [--help]    display this message and exits
EOF
	exit $1
}

while test $# -gt 0; do
  case "$1" in
  -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
  *) optarg= ;;
  esac

  case $1 in
    --help)
      usage 0 1>&2
      ;;
    *)
      usage 0 1>&2
      ;;
  esac
  shift
done

sed 's/^ *GtsSurface/GfsSolid {}/g' | \
sed 's/GtsSurfaceFile/GfsSolid/g' | \
sed 's/surface =/solid =/g'