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function locate_source {    tarball=$( ls *.tar.* | wc -l )        if [ $tarball -gt "1" ]; then            echo "More than one tarball here"            exit            else            found=$( ls *.tar.* )            echo "I found the following sources:"            echo " "            echo ${found/%-[0-9]*/}            $APP=$found            echo " "            fi         }