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OK, but this would only make sense if "search-engine" would be a variable with some content. This is not the case (and can't be, see above), so i still do not understand how this eval-construct came...

The hyphen can be used in CoBOL code, but it is considered as plain text for Unix shells. I've fallen across this the other way around when I wanted to set a variable to a value built from another...

- is not a valid character for a variable name. If you include it by forcing it via ${variable-name}, it will take that to mean "default to the value of 'name' when 'variable' is undefined".
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