I’m a novice in PowerShell.

Recently I encountered a problem about how to cascade commands or functions. I’ve found 2 ways:

• CMD_B (CMD_A ($x))
• $x | CMD_A | CMD_B

But, what’s the difference between the above 2 ways?

For example, the results of Write-Output (Get-Process) and Get-Process | Wirte-Output look the same. Are there different details hidden?

I’ve searched the doc about grouping-operator () and Pipeline operator |, and find:

Piping grouped expressions

When used as the first segment of a pipeline, wrapping a command or expression in parentheses invariably causes enumeration of the expression result. If the parentheses wrap a command, it’s run to completion with all output collected in memory before the results are sent through the pipeline.

Grouping an expression before piping also ensures that subsequent object-by-object processing can’t interfere with the enumeration the command uses to produce its output.

But I don’t quite understand it. Maybe it’s because I lack the basic knowledge of pipelines.

Thanks in advance.