https://powershellexplained.com/2019-08-11-Powershell-if-then-else-equals-operator/
If ($fruit -eq "orange") {'We found an orange'}
ElseIf ($fruit -eq "apple") {'We found an apple'}
IF (!$DEFSERVER -OR $DUPSERVER) #IF NOT DEFINED OR DEFINED IF ($DOUBLESIDED -eq "TRUE")
get-service | foreach-object {
if ($_.status -eq "stopped") { write-host -f red $_.name $_.status }
else { write-host -f green $_.name $_.status }
}
Equals/Not Equals (Math or Text)
-eq case insensitive equality -ieq case insensitive equality -ceq case sensitive equality -ne case insensitive not equal -ine case insensitive not equal -cne case sensitive not equal
Math Operators:
-gt greater than -igt greater than, case insensitive -cgt greater than, case sensitive -ge greater than or equal -ige greater than or equal, case insensitive -cge greater than or equal, case sensitive -lt less than -ilt less than, case insensitive -clt less than, case sensitive -le less than or equal -ile less than or equal, case insensitive -cle less than or equal, case sensitive
Wildcard Search: (-like)
-like case insensitive wildcard -ilike case insensitive wildcard -clike case sensitive wildcard -notlike case insensitive wildcard not matched -inotlike case insensitive wildcard not matched -cnotlike case sensitive wildcard not matched
? will match any single character * will match any number of characters
Regex Search: (-match)
-match case insensitive regex -imatch case insensitive regex -cmatch case sensitive regex -notmatch case insensitive regex not matched -inotmatch case insensitive regex not matched -cnotmatch case sensitive regex not matched
RegEx Pattern Building:
* if ( $value -match 'S-\w\w\w-SQL\d\d') \d digit [0-9] \w alpha numeric [a-zA-Z0-9_] \s whitespace character . any character except newline () sub-expression \ escape the next character
Type: (-is)
-is of type -isnot not of type
if ( $value -is [string] ) if ( $Service -isnot [System.ServiceProcess.ServiceController] )
Arrays:
$array = 1..6
if ( $array -gt 3 )
$array = 1..6
if ( $array -contains 3 )
-contains case insensitive match -icontains case insensitive match -ccontains case sensitive match -notcontains case insensitive not matched -inotcontains case insensitive not matched -cnotcontains case sensitive not matched
$array = 1..6
if ( 3 -in $array )
-in case insensitive match -iin case insensitive match -cin case sensitive match -notin case insensitive not matched -inotin case insensitive not matched -cnotin case sensitive not matched
Logical
-not -and -or -xor # both items are $false or both items are $true, then the whole expression is $false
AND
if ( ($age -gt 13) -and ($age -lt 55) )
EXTRA
if ( Get-Process Notepad* ) if ( Get-Process | Where Name -eq Notepad ) if ( (Get-Process) -and (Get-Service) )
NULL:
if ( $null -eq $value )