No. You can read the filter rules directly from the standard input (stdin) by using the "-" (a single hyphen) instead of the rules file path.  For example

No. You can read the filter rules directly from the standard input (stdin) by using the "-" (a single hyphen) instead of the rules file path.  For example:

% echo 'set edition=2; print "[centre]"; write;' | grib_filter -o out.grib - in.grib

Or like this:

% grib_filter -o out.grib - in.grib <<EOF
set edition=2;
print "[centre]";
write;
EOF