Notes: Flow Control

Part 1: If/Else switches

Powershell if/else switches

• -gt => greater than
• -lt => less than
• -ge => greater than or equal to
• -le => less than or equal to

Powershell checking empty/null

String comparisons with -like

Wildcard Characters

• • • Match zero or more characters
• a* - Match aA, ag, and Apple
• a* - doesn't match banana

? - Match one character in that position

• ?n matches an, in, and on but not ran

[] - Match a range of characters or specific characters

• [a-l]ook matches book, cook, and look but not took
• [bc] matches book and cook but not hook

Regex & -match

• -match checks if string contains regex: 'book' -match 'oo' returns true

-contains

• -contains checks if a value is in a collection

Part 2 Arrays

Array Initialization and Count

@ sign is used to define arrays and collections

Count gives number of elements

Array Access

Strings are arrays and can be defined with Write-Output

Array -join, -contains, -in

[pscustomobject]

Part 3 Functions

Function Definition

Function Call

Dot Notaion

• Helps call functions from other script files
• After dot notation, the functions in the other script files can be used in the current script file