问题描述
这可能很奇怪，但是请和我在一起.我只想将管道结果的最后一个元素分配给变量.我当然知道如何用常规"代码来做到这一点，但是由于这必须是一成不变的.
This might be weird, but stay with me.I want to get only the last element of a piped result to be assigned to a varaiable.I know how I would do this in "regular" code of course, but since this must be a one-liner.
更具体地说，我对从FTP请求ListDirectoryDetails获取结果时获得文件扩展名感兴趣.
More specifically, I'm interested in getting the file extension when getting the result from an FTP request ListDirectoryDetails.
由于这是在字符串扩展中完成的，所以我找不到正确的代码.
Since this is done within a string expansion, I can't figure out the proper code.
目前，我正在接受最近的3 hars，但这真是令人讨厌.
Currently I'm getting the last 3 hars, but that is real nasty.
新对象PSObject-属性@ {
LastWriteTime = [DateTime] :: ParseExact($ tempDate，"MMM dd HH:mm"，[System.Globalization.CultureInfo] :: InvariantCulture)
类型= $(if([int] $ tempSize -eq 0){目录"}否则{$ tempName.SubString($ tempName.length-3,3)})
名称= $ tempName
大小= [int] $ tempSize
}
New-Object PSObject -Property @{
LastWriteTime = [DateTime]::ParseExact($tempDate, "MMM dd HH:mm",[System.Globalization.CultureInfo]::InvariantCulture)
Type = $(if([int]$tempSize -eq 0) { "Directory" } else { $tempName.SubString($tempName.length-3,3) })
Name = $tempName
Size = [int]$tempSize
}
我的想法是做类似的事情
My idea was doing something similar to
$ tempName.Split(.")| ? {$ _ -eq $ input [$ input.Length-1]}
$tempName.Split(".") | ? {$_ -eq $input[$input.Length-1]}
也就是说，遍历所有对象，但是只能取出我要查看的元素是输入数组的最后一个元素.
that is, iterate over all, but only take out where the element I'm looking at is the last one of the input-array.
我想念什么?
推荐答案
几种方法可以做到这一点:
A few ways to do this:
$name = 'c:\temp\aaa.bbb.ccc'
# way 1
$name.Split('.') | Select-Object -Last 1
# way 2
[System.IO.Path]::GetExtension($name)
# or if the dot is not needed
[System.IO.Path]::GetExtension($name).TrimStart('.')
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