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How do I copy a selected number of messages from a GRIB file?

Step-by-step guide

Say you want to copy the first 3 messages. This can be done with:

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1. But it is better to write a rules file and use grib_filter:

   Code Block
   language bash title my.filter
   if (count < 4) { print "Copying message number [count]"; write; }

   
   

2. Then run this as follows:

   % grib_filter -o out.grib my.filter in.grib

   Of course you can make the IF condition more complicated e.g. select a range of messages to be copied:

   Code Block
   language bash
   if (count == 3 || count == 13) { write; # Write out message 3 and 13 only }

   
   

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