...
Where clause. Messages are processed only if they match all the key/value constraints. A valid constraint is of type key=value or key!=value. For each key a string (key:s), a double (key:d) or an integer (key:i) type can be specified. Default type is string. In the value you can also use the forward-slash character '/' to specify an OR condition (i.e. a logical disjunction) Note: only one -w clause is allowed.
...
json output
...
Order by. The output will be ordered according to the order by directive. Order by example: "step:i asc, centre desc" (step numeric ascending and centre descending)
...