wgrib2: -not_if
Introduction
The -not_if option returns true or false. If true, then
the next "output" option is executed otherwise it isn't. In order to write
headers into the output file, "inv_output" options are conditionally executed
depending on the flag.
Note, the effects of nesting of -not_if is not defined
and the flag is reset after processing the record.
The -not_if option was written so that you can process
the file once and create several output files. For example,
old: wgrib2 -match_inv gribfile >inv
grep -v " mb:" inv | wgrib2 -i gribfile -grib flx.grb
grep " mb:" inv | wgrib2 -i gribfile -grib prs.grb
In the above example, the "mb" fields are written to prs.grb
and the rest are written to flx.grb.
new:
wgrib2 gribfile -not_if " mb:" -grib flx.grb -if " mb:" -grib prs.grb
Note that you can use any number of
-if and -not_if
options and they use the same output file.
wgrib2 gribfile -not_if ":surface:" -grib save.grb
Usage
-not_if X
X is a regular expression, returns not X.
See also: -not,
-end,
-i.
-if.
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