PS C:Powershell> $books="元素1","元素2","元素3"
PS C:Powershell> $books[0]
元素1
PS C:Powershell> $books[1]
元素2
PS C:Powershell> $books[($book.Count-1)]
元素3
PS C:Powershell> $books[-1]
元素3

PS C:Powershell> $result=ls
PS C:Powershell> $result[0,3,5,12]
  Directory: C:Powershell

Mode        LastWriteTime   Length Name
----        -------------   ------ ----
d----    2011/11/23   17:25      ABC
-a---    2011/11/24   20:04   26384 a.txt
-a---    2011/11/24   20:27   12060 alias.ps1
-a---    2011/11/24   17:37    7420 name.html

PS C:Powershell> $books="元素1","元素2","元素3"
PS C:Powershell> $books[($books.Count)..0]
元素3
元素2
元素1

PS C:Powershell> $books="元素1","元素2","元素3"
PS C:Powershell> $books+="元素4"
PS C:Powershell> $books
元素1
元素2
元素3
元素4

PS C:Powershell> $num=1..4
PS C:Powershell> $num
1
2
3
4
PS C:Powershell> $num=$num[0..1]+$num[3]
PS C:Powershell> $num
1
2
4