[gradsusr] Use wgrib2 to check if grib2 file is valid

[Love, Mr. Gary, Contractor, Code 7542]

Wesley,



Have you tried



|     wgrib2 -v 2016101212.gfs.t12z.pgrb2f001 2>&1 | grep ERROR



The redirect, 2>&1,  is supposed to add the results of STDERR to STDOUT.



Gary Love



From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On 
Behalf Of Wesley Ebisuzaki - NOAA Federal
Sent: Thursday, October 13, 2016 6:02 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] Use wgrib2 to check if grib2 file is valid



Ivan,

|     wgrib2 -v 2016101212.gfs.t12z.pgrb2f001 | grep ERROR

does not work because the error message is sent to STDERR.

It depends on the shell but in bash,

      wgrib2 -v 2016101212.gfs.t12z.pgrb2f00 2>stderr.txt

will send the error messages to stderr.txt

My (bash) suggestion is

wgrib2 2016101212.gfs.t12z.pgrb2f001 > tmp.inv

# now to check the return code

if ["$?" -ne 0 ] ; then

  echo "ERROR"

  do_something

fi

# since is is possible that you got no file or a smaller but complete file

# check the number of lines in the inventory .. see if you got what you want

N_REC=22

if [ "$N_REC" -ne `wc -n <tmp.inv` ] ; then

   echo "ERROR2"

   do_something

fi

rm tmp.inv

Wesley



On Wed, Oct 12, 2016 at 5:48 PM, Ivan Toman <ivtoman at inet.hr> wrote:

Hello Jeff,

I do compare file sizes currently, but as they change little bit, it is
still not too robust. I'm trying to find fail proof solution.

So as I said, I can't capture response from wgrib2 into variable for
some reason. See these two examples:

Example 1) Capturing date output to variable:
$ response=`date`
$ echo $response
Wed Oct 12 20:50:46 UTC 2016

Works just fine.


Wgrib2 error:
wgrib2 -v 2016101212.gfs.t12z.pgrb2f001 | grep ERROR

*** FATAL ERROR: rd_grib2_msg_seq_file, read outside of file, bad grib
file ***


Example 2) Trying to capture ERROR from wgrib2:
$ response=`wgrib2 -v 2016101212.gfs.t12z.pgrb2f001 | grep ERROR`

*** FATAL ERROR: rd_grib2_msg_seq_file, read outside of file, bad grib
file ***
$ echo $response


Nothing is returned. Empty variable. That is what I try to fix..

Thank you,
Ivan Toman

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