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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;
}

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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
}

Code Block
if (count % 2 == 0) { write; # Write out even-numbered messages, e.g., 2, 4, 6 etc }

Info
Note: The "count" key starts from 1

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