writeShellApplication: use lib.concatMapAttrsStringSep

        ${lib.concatMapStringsSep "\n" (option: "set -o ${option}") bashOptions}

      ''

      + lib.optionalString (runtimeEnv != null) (

        lib.concatStrings (

          lib.mapAttrsToList (name: value: ''

        lib.concatMapAttrsStringSep "" (name: value: ''

          ${lib.toShellVar name value}

          export ${name}

        '') runtimeEnv

      )

      )

      + lib.optionalString (runtimeInputs != [ ]) ''

        export PATH="${lib.makeBinPath runtimeInputs}${lib.optionalString inheritPath ":$PATH"}"