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lang-bash
$(...)command substitution sees only the indexes (a list of numbers separated by newlines), because of thecut -d' ' -f1after the sort. This could be easily demonstrated by atee /dev/ttyat the end of the$(...).cut.${!in[@]}or${#in[i]}/$ivariable expansions because they only contain digits which are not subject to glob expansion and theunset IFSwill reset theIFSto space, tab, newline. In fact, quoting them would be harmful, because it will give the false impression that such quoting is useful and effective, and that the setting ofIFSand/or filtering the output ofsortin the second example could be safely done away with.incontains"testing * here"andshopt -s nullglobis set before the loop.