替换可能跨越两行的模式

我正在尝试了解N选项在 Sed 编辑器中的工作方式。我的目标是在“file01”中将“系统管理员”更改为“桌面用户”，同时刹车线甚至最后一行。Sed 不会赶上最后一行，因为不会有下一行。另一个修改是必要的，例如添加：

sed 's/System Administrator/Desktop User/'，但是这个和：

sed 'System\nAdministrator/Desktop\nUser/'以一种意想不到的方式切换（对我来说），这样一个命令在最后一行或最后两行停止工作。这发生在两者N之间或两者之间。我正在使用 GNU Sed，版本 4.4 。

#cat file01
The first meeting of the Linux System
Administrator's group will be held on Tuesday.
Another line
And here we have: System Administrator's Group as well.
1.System Administrator's group.
2.System Administrators Group.
3.System Administrators Group.
The first meeting of the Linux System
Administrator's group will be held on Tuesday.
System Administrators Group.

案例 1 , 之后的两个命令N

# sed '
>N
>s/System\nAdministrator/Desktop\nUser/
>s/System Administrator/Desktop User/
> ' file01
The first meeting of the Linux Desktop
User's group will be held on Tuesday.
Another line
And here we have: Desktop User's Group as well.
1.Desktop User's group.
2.System Administrators Group.
3.Desktop Users Group.
The first meeting of the Linux System
Administrator's group will be held on Tuesday.
Desktop Users Group.

案例2，sed 's/System Administrator/Desktop User/'之前N。

# sed '
> s/System Adminitrator/Desktop User/
> N
> s/System\nAdministrator/Desktop\nUser/
> ' file01
The first meeting of the Linux Desktop
User's group will be held on Tuesday.
Another line
And here we have: System Administrator's Group as well.
1.Desktop User's group.
2.System Administrators Group.
3.Desktop Users Group.
The first meeting of the Linux System
Administrator's group will be held on Tuesday.
System Administrators Group.

这对我来说似乎很奇怪，并且无法弄清楚出了什么问题。[编辑]：更多细节。

我正在寻找用"Desktop User"替换"System Administrator " 。此外，如果一行以“系统”结尾而下一行以“管理员”开头，我会将它们相应地替换为“桌面”和“用户”。所有这些都取自一本书，但输出与书中所说的不符。我最终不知道出了什么问题。我发现描述我的问题的唯一世界是优先级，我道歉，看来我错了。