如何将文件中行的最后一个字段附加到powershell cli上的变量？

Question

Here is my file hello.txt :

"ReceiptHandle" = "hellomyfriend==++"

I would like to append only the last field of a line to a variable:

$friend = hellomyfriend==++

Answer 1

Assuming that is all that's in your hello.txt file. The following would assign "" to your $friend variable...

$myhash = (gc 'hello.txt') -replace """","" | ConvertFrom-StringData
$friend = $myhash["ReceiptHandle"]

ConvertFrom-StringData makes this easy because your text is already in "something = value" format.

So what's going on here? First,

gc 'hello.txt'

is getting the contents of your file. I encapsulate it in () so that i can use..

-replace """",""

.. to get rid of the surrounding double-quotes. That's piped into ConvertFrom-StringData, which converts the string into a named key/value pair [hashtable]. From there, I can access the second part by interrogating the hashtable.

Alternatively, you could put this all on one line...

(gc 'hello.txt') -replace """","" | ConvertFrom-StringData | %{$friend = $_["ReceiptHandle"]}