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lang-bash
: ${fdir:="${@: -1}"}, the quotes are in the wrong place as the expansion would be subject to split+glob (and even when passed to:constitute the kind of DoS vulnerability described at Security implications of forgetting to quote a variable in bash/POSIX shellszsh(or fish), you'd rather use$argv[-1]. Also${@[-1]}in zsh or yash.${@:$#}.$0if there were no positional parameters"${@:$#}"as safer option than"${@: -1}", in case one misses the space.