Comparison and Logical Operators

The operators that PowerShell uses are as follows. For a full breakdown of ALL types of operators in PowerShell go here: Link there’s lots of wisdom on this page that I could have used years ago, great if you know a bit of PowerShell already.

Comparative Operators

Operator	Function
`-eq`	Equals
`-ne`	Not Equals
`-gt`	Greater Than
`-lt`	Less Than
`-le`	Less or Equal to
`-ge`	Greater or Equal to
`-match`	Regex, it’s not a method the jedi would teach you
`-notmatch`	Negated version of `-match`
`-like`	Pattern Matches (can use `*` ) wildcards
`-notlike`	Negated version of `-like`
`-in`	Value on left is one of `(x, y, z)` values
`-notin`	Negated version of `-in`
`-contains`	Value on left contains value on right
`-notcontains`	Negated version of `contains`

These are what will let you generate $true or $false statements:

'Statement 1'
45 -eq 46

'Statement 2'
'sink' -ne 'toilet'

'Statement 3'
20 -lt 100

'Statement 4'
30 -ge 30.0

'Statement 5'
"1234-1233-123-09090" -match "\d{4}-.*-...-09090"

'Statement 6'
"blue man group" -like "blue ma*"

'Statement 7'
7 -in (3,2,3,2)

'Statement 8'
@("India", "Korea", "Singapore") -contains "Korea"

Logical Operators

Sometimes we want to string together some statements to create an output instead of just one condition for this we need logical operators.

Operator	Function
`-and`	`$true` when both statements are true
`-or`	`$true` when either statement is true
`-xor`	`$true` when only one statement is true
`-not` or `!`	makes `$true` into `$false`, and vice versa

We only need to put the conditions that these are operating on inside (). Examples:

'Statement 1'
(1+1 -eq 2) -and ('l' -lt 'llllllll')

'Statements 2'
('height' -like 'hei*') -or (2 -lt 1)
($true) -or ($true)

'Statements 3'
($true) -xor ($false)
($true) -xor ($true)

'Statements 4'
-not $true
!$false

`-is` determinations

If looking to evaluate whether a value is of a certain type we can use -is and -isnot.

$date = Get-Date

$date -is [DateTime]

4 -isnot [System.Int32]

4 -isnot [System.String]

"word" -is [System.String]

For more information on Data Types Data Structures.