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From: Sergey Afonin <asy@altlinux.ru>
To: ALT Linux Team development discussions <devel@lists.altlinux.org>
Date: Fri, 22 Jul 2016 13:01:43 +0400
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On Friday 22 July 2016, Ruslan Hihin wrote:

> Я думаю, вы уже нашли, но для памяти    - с окончанием S - поиск
> параметра, без S -  установка значения  параметра. 

Нет, установка и сравнение зависят от оператора: 

       "=="
           Compare for equality.

       "="
           Assign a value to a key. Keys that represent a list are reset and only this single
           value is assigned.

ATTR может использоваться и для сравнения, и для установки:

       ATTR{filename}, SYSCTL{kernel parameter}
           Match sysfs attribute values of the event device. Trailing whitespace in the
           attribute values is ignored unless the specified match value itself contains
           trailing whitespace.  Match a kernel parameter value.

       ATTR{key}
           The value that should be written to a sysfs attribute of the event device.

-- 
С уважением, Сергей Афонин.