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Can somebody explain to me what is the difference between dot notation and select-object in Powershell? How these two methods of accessing properties differ internally?
I've noticed that running (ls).name gives basically the same results as ls | select-object name however running ls | select-object name | export-csv foo.csv gives me proper csv file while trying (ls).name | export-csv foo.csv gives me the file with length.
In both cases gettype() returns Object[]
685
The PowerShell dot-source operator brings script files into the current session scope. It is a way to reuse script. All script functions and variables defined in the script file become part of the script it is dot sourced into. It is like copying and pasting text from the script file directly into your script.
operator? (Select multiple) It enables you to access instance variables of any objects within a class.
Object properties To get the properties of an object, use the Get-Member cmdlet. For example, to get the properties of a FileInfo object, use the Get-ChildItem cmdlet to get the FileInfo object that represents a file.
The dot sourcing feature lets you run a script in the current scope instead of in the script scope. When you run a script that is dot sourced, the commands in the script run as though you had typed them at the command prompt.
The select-object cmdlet wraps the result in a new object. To see the differences (look at the Type) use the get-member cmdlet.
(ls).Name | get-member
and
ls | select-object Name | get-member
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