Linux Udev：在比较中使用结果

谁能给我一个提示，为什么这样做

ACTION=="add", SUBSYSTEM=="block", PROGRAM="/bin/echo -n 12345", ENV{ID_FS_UUID}=="12345", RUN+="/path/to/some/script.sh %k %c $env{ID_FS_UUID}"

这不是吗

ACTION=="add", SUBSYSTEM=="block", PROGRAM="/bin/echo -n 12345", ENV{ID_FS_UUID}=="%c", RUN+="/path/to/some/script.sh %k %c $env{ID_FS_UUID}"

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在指定了%c的情况下，您必须检查是否提供了要替换的$result。曼乌德夫：

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如果您没有提供正确的$result，那就是您的问题。

您好，David，我已经检查了$result，它将按预期传递到脚本，并在脚本中回显$2打印12345。我猜比较ENV{ID_FS_UUID}==%c在程序执行之前执行，但它对我来说似乎是一个bug，或者我错过了什么？

$result, %c
    The string returned by the external program requested with PROGRAM.
    A single part of the string, separated by a space character, may be
    selected by specifying the part number as an attribute: "%c{N}". If
    the number is followed by the "+" character, this part plus all
    remaining parts of the result string are substituted: "%c{N+}".