Filter an enumeration by using a conditional expression

Synonyms:

Where-Object
where
?

Example:

$names = @( "Aaron", "Albert", "Alphonse","Bernie", "Charlie", "Danny", "Ernie", "Frank")

$names | Where-Object { $_ -like "A*" }
$names | where { $_ -like "A*" }
$names | ? { $_ -like "A*" }

Returns:

Aaron
Albert
Alphonse

Sort an enumeration in either ascending or descending order

Synonyms:

Sort-Object
sort

Assuming:

$names = @( "Aaron", "Aaron", "Bernie", "Charlie", "Danny" )

Ascending sort is the default:

$names | Sort-Object
$names | sort

Aaron
Aaron
Bernie
Charlie
Danny

To request descending order:

$names | Sort-Object -Descending
$names | sort -Descending

Danny
Charlie
Bernie
Aaron
Aaron

You can sort using an expression.

$names | Sort-Object { $_.length }

Aaron
Aaron
Danny
Bernie
Charlie

You can group an enumeration based on an expression.

Synonyms:

Group-Object
group

Examples:

$names = @( "Aaron", "Albert", "Alphonse","Bernie", "Charlie", "Danny", "Ernie", "Frank")

$names | Group-Object -Property Length
$names | group -Property Length

Response:

Count	Name	Group
4	5	{Aaron, Danny, Ernie, Frank}
2	6	{Albert, Bernie}
1	8	{Alphonse}
1	7	{Charlie}

Projecting an enumeration allows you to extract specific members of each object, to extract all the details, or to compute values for each object

Synonyms:

Select-Object
select

Selecting a subset of the properties:

$dir = dir "C:\MyFolder"

$dir | Select-Object Name, FullName, Attributes
$dir | select Name, FullName, Attributes

Name	FullName	Attributes
Images	C:\MyFolder\Images	Directory
data.txt	C:\MyFolder\data.txt	Archive
source.c	C:\MyFolder\source.c	Archive

Selecting the first element, and show all its properties:

$d | select -first 1 *

PSPath
PSParentPath
PSChildName
PSDrive
PSProvider
PSIsContainer
BaseName
Mode
Name
Parent
Exists
Root
FullName
Extension
CreationTime
CreationTimeUtc
LastAccessTime
LastAccessTimeUtc
LastWriteTime
LastWriteTimeUtc
Attributes