We all need to peek at the answers from time to time. This post is simply a quick reference guide for basic PowerShell tips, tricks, how-to’s, explanations, etc.
I’ve found these items useful in the past, and hope you do as well.
Links to Microsoft or other documentation have made where applicable, and I’ll keep adding to it.
Variables
$var = “string”
Assign variable
[Type]$var=”typedVar”
Assign strong typed variable
[ValidateRange(1,9)][int]$x=1
Assign strong typed attribute controlled variable
$a,$b,$c = 0 or $a,$b = ‘a’,’b’
Assign multiple variables
$a,$b = $b,$a
Flip variables
Scopes
global, local, private or script
$global:var = “var”
Assign global scoped variable
Arrays
“a”, “b”, “c”
Array of strings
@()
Empty array
1,(2,3),4
Array within array
,”hi”
Array of one element
$arr[5]
Sixth element of array
$arr[2..20]
Return elements 3 thru 21
$arr[-1]
Return last array element
$arr[-3..-1]
Display last threeelementsofarray
$arr[1,4+6..9]
Elements at index positions 1,4, 6 to 9
@(Get-Process)
Force result to an array
$arr[($arr.length-1)..0]
Reverse array
$arr[1] += 200
Add to existing array item value
$b = $arr[0,1 + 3..6]
New array from elements of $arr array
$z = $arrA + $arrB
Combine two arrays into single array
Arrays
$hash = @{}
Create empty hash table
@{foo=1; bar=’value2′}
Create, initialize hash table
[ordered]@{a=1; b=2; c=3}
Create ordered dictionary
$hash.key1 = 1
Assign 1 to key key1
$hash.key1
Return value of key1
$hash[“key1”]
Return value of key1
$hash.GetEnumerator | sort Key
Sort hash table by Key
[pscustomobject]@{x=1;z=”z”}
Create custom object
Strings
“$var expand”
String with expansion “
‘$var no expand’
String with no expansion ‘
@” Here-String “@
Here-String -quotes, expressions, etc. Single quotes for no expressions
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