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My bad.. I am new to ROS and hence couldn't figure this out previously.

when we <include ...&gt;="" a="" file="" as="" in="" the="" above="" case,="" we="" are="" passing="" all="" the="" parameters="" that="" are="" mentioned="" in="" the="" <include="" &gt;......<="" include=""> to be used in the file. (In this case, nodelet_manager.launch.) When we don't refer or use them in that file, this unused args issue will comeup.. .May be one of the cases where this issue might come up

My bad.. I am new to ROS and hence couldn't figure this out previously.

when we <include ...&gt;="" a="" file="" as="" in="" the="" above="" case,="" we="" are="" passing="" all="" the="" parameters="" that="" are="" mentioned="" in="" the="" <include="" &gt;......<="" include=""> ...> a file as in the above case, we are passing all the parameters that are mentioned in the <include >......</include> to be used in the file. (In this case, nodelet_manager.launch.) When we don't refer or use them in that file, this unused args issue will comeup.. .May be one of the cases where this issue might come up