Unix ps手册页中的这一段是什么意思？

我无法理解以下描述：

   a               Lift the BSD-style "only yourself" restriction, which is
                   imposed upon the set of all processes when some BSD-style
                   (without "-") options are used or when the ps personality
                   setting is BSD-like. The set of processes selected in this
                   manner is in addition to the set of processes selected by
                   other means. An alternate description is that this option
                   causes ps to list all processes with a terminal (tty), or
                   to list all processes when used together with the x
                   option.

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我唯一能理解的是另一种描述是xxxx。取消BSD风格的“只有你自己”限制和其他句子意味着什么？

默认情况下，BSD版本的

ps

（作为扩展，Linux的

ps

当它被当作BSD

ps

时，通过传递它的BSD样式选项，或者通过将

ps_PERSONALITY

或

CMD_ENV

环境变量设置为

BSD

）只列出运行

ps

的用户拥有的进程

a

参数取消了该限制，并将显示进程，而不考虑其所有者