How do I use an OR condition (logical disjunction) in a "where" clause? - eccodes FAQ

How do I use an OR condition (logical disjunction) in a "where" clause?

Step-by-step guide

For example in grib_get you may want to show all messages which have level of 100, 150 or 200. The way to do this is to use the "/" (forward slash) character in the "where" clause (for the -w switch)

% grib_get -w level=100/150/200 ...

1. This can be combined with an "AND" condition (logical conjunction). So if I want to show all messages whose level is either 0 or 1 and whose type is "an":

   % grib_ls -w level=0/1,dataType=an ...

2. This would be equivalent to the pseudo-code:

   if (dataType == "an" AND (level == 0 OR level == 1)) ...

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