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set -- *.rarand[ -e "$1" ]does do exactly?set -- *.rarsets$1to the first rar file,$2to the second and so on. If there are none then it sets$1to the string*.rar. The[ -e "$1" ]tests to see if$1exists, and the&&says "run the thing on the left and if it works then run the thing on the right".-roption does not seem to work for me, I thought it did. I only find and extract top-level RAR files.