How To Construct IF and Else Conditional Statements
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This document discusses using IF and ELSE conditional statements in PowerShell scripts. It provides code snippets to check for input and return different outputs based on whether input is provided or not. When input is provided, it will write the input and beep at a high pitch. If no input is provided, it will write an error message and beep at a lower pitch. The document also provides background on PowerShell functions and execution policies.
![Windows PowerShell Basics - IF & Else Conditional Statements
1 | P a g e
Overview
PowerShell functions are helpful in saving time when you have repetitive task(s) to be executed. In this
guide we will demonstrate, as to how to construct a “IF” & “ELSE” conditional statements.
Applies To
Tested on Windows 10, Windows 2008 R2 and Windows 2012.
Pre-Requisites
Launch PowerShell Command Console or PowerShell ISE.
To run this script, Execution Policy should be set to either of these “AllSigned” or “RemoteSigned” or
“Unrestricted”, you can get current execution policy by running the command; “Get-ExecutionPolicy”.
Each Policy type and its purpose is shown in the below table.
Policy Type Purpose
Restricted No scripts can be run. Windows PowerShell can be used only in interactive mode.
AllSigned Only scripts signed by a trusted publisher can be run.
RemoteSigned Downloaded scripts must be signed by a trusted publisher before they can be run.
Unrestricted No restrictions; all Windows PowerShell scripts can be run.
PowerShell Script – Function
This PowerShell script call function with function’s mandatory argument / parameter value, when the
argument value is passed; Passed value will be displayed else an exception will be thrown.
Code Snippet – IF Statement
The code snippet is for demonstrating “IF” Statement / condition only.
#
# Simple Conditional Statements - IF
#
Clear-Host
$Input=Read-Host "Key-In Input"
if ($Input -ne "") {
Write-Host "`nValid Input, Keyed Input String:" $Input -ForegroundColor Green
[console]::Beep(500,600)
}](https://image.slidesharecdn.com/windowspowershellbasics-howtoconstructifandelseconditionalstatements-171221081205/85/How-To-Construct-IF-and-Else-Conditional-Statements-2-320.jpg)
![Windows PowerShell Basics - IF & Else Conditional Statements
2 | P a g e
PowerShell Output – IF Condition
When Input text is provided upon execution of the script;
PowerShell Output – IF Condition – No Input
When “NO” Input text is provided upon execution of the script; script will simply execute and exit.
Code Snippet – IF & ELSE Statement
The code snippet below is for demonstrating “IF” and “ELSE” statement.
#
# Simple Conditional Statements - IF & Else Statement
#
Clear-Host
$Input=Read-Host "Key-In Input"
if ($Input -ne "") {
Write-Host "`nValid Input, Keyed Input String:" $Input -ForegroundColor Green
[console]::Beep(500,600)
} else {
Write-Host "Invalid Input" -ForegroundColor Red
[console]::Beep(900,600)
}
PowerShell Output – IF & ELSE Condition
When Input text is provided upon execution of the script;](https://image.slidesharecdn.com/windowspowershellbasics-howtoconstructifandelseconditionalstatements-171221081205/85/How-To-Construct-IF-and-Else-Conditional-Statements-3-320.jpg)
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How To Construct IF and Else Conditional Statements
- 1. Windows PowerShell Basics - IF & Else Conditional Statements i | P a g e Table of Contents Overview.......................................................................................................................................................1 Applies To..................................................................................................................................................1 Pre-Requisites ...........................................................................................................................................1 PowerShell Script – Function ........................................................................................................................1 Code Snippet – IF Statement ....................................................................................................................1 PowerShell Output – IF Condition.........................................................................................................2 PowerShell Output – IF Condition – No Input.......................................................................................2 Code Snippet – IF & ELSE Statement ........................................................................................................2 PowerShell Output – IF & ELSE Condition.............................................................................................2 PowerShell Output – IF & ELSE Condition – No Input...........................................................................3
- 2. Windows PowerShell Basics - IF & Else Conditional Statements 1 | P a g e Overview PowerShell functions are helpful in saving time when you have repetitive task(s) to be executed. In this guide we will demonstrate, as to how to construct a “IF” & “ELSE” conditional statements. Applies To Tested on Windows 10, Windows 2008 R2 and Windows 2012. Pre-Requisites Launch PowerShell Command Console or PowerShell ISE. To run this script, Execution Policy should be set to either of these “AllSigned” or “RemoteSigned” or “Unrestricted”, you can get current execution policy by running the command; “Get-ExecutionPolicy”. Each Policy type and its purpose is shown in the below table. Policy Type Purpose Restricted No scripts can be run. Windows PowerShell can be used only in interactive mode. AllSigned Only scripts signed by a trusted publisher can be run. RemoteSigned Downloaded scripts must be signed by a trusted publisher before they can be run. Unrestricted No restrictions; all Windows PowerShell scripts can be run. PowerShell Script – Function This PowerShell script call function with function’s mandatory argument / parameter value, when the argument value is passed; Passed value will be displayed else an exception will be thrown. Code Snippet – IF Statement The code snippet is for demonstrating “IF” Statement / condition only. # # Simple Conditional Statements - IF # Clear-Host $Input=Read-Host "Key-In Input" if ($Input -ne "") { Write-Host "`nValid Input, Keyed Input String:" $Input -ForegroundColor Green [console]::Beep(500,600) }
- 3. Windows PowerShell Basics - IF & Else Conditional Statements 2 | P a g e PowerShell Output – IF Condition When Input text is provided upon execution of the script; PowerShell Output – IF Condition – No Input When “NO” Input text is provided upon execution of the script; script will simply execute and exit. Code Snippet – IF & ELSE Statement The code snippet below is for demonstrating “IF” and “ELSE” statement. # # Simple Conditional Statements - IF & Else Statement # Clear-Host $Input=Read-Host "Key-In Input" if ($Input -ne "") { Write-Host "`nValid Input, Keyed Input String:" $Input -ForegroundColor Green [console]::Beep(500,600) } else { Write-Host "Invalid Input" -ForegroundColor Red [console]::Beep(900,600) } PowerShell Output – IF & ELSE Condition When Input text is provided upon execution of the script;
- 4. Windows PowerShell Basics - IF & Else Conditional Statements 3 | P a g e PowerShell Output – IF & ELSE Condition – No Input When “NO” Input text is provided upon execution of the script; script will simply execute and message will be displayed as shown below.