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(for /f %%f in ('$xxx') do echo+%%f)||echo+!errorlevel!复制代码
真正改变内部“返回值”的是无取值的 for /f,再由 || 把它表现到 errorlevel 变量中:
ERROR_SUCCESS 0 (0x0) The operation completed successfully. ERROR_INVALID_FUNCTION 1 (0x1) Incorrect function. ERROR_FILE_NOT_FOUND 2 (0x2) The system cannot find the file specified. ERROR_PATH_NOT_FOUND 3 (0x3) The system cannot find the path specified.
12 楼的 $xxx 输出是在 StdOut,不在 StdIn,所以 for /f 的输入仍然为空