PowerShell Notes
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Path
Powershell.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
Get version
$PSVersionTable.PSVersion
Windows PowerShell Copyright (C) 2016 Microsoft Corporation. All rights reserved. PS C:\Windows\System32\WindowsPowerShell\v1.0> $PSVersionTable.PSVersion Major Minor Build Revision ----- ----- ----- -------- 5 1 14393 1198
Example Scripts
Check in C:\Apps\ps for examples!
Notes
- https://blog.netspi.com/15-ways-to-bypass-the-powershell-execution-policy/
- http://www.howtogeek.com/204166/how-to-configure-windows-to-work-with-powershell-scripts-more-easily/
PS C:\Scripts> Start-Process cmd -ArgumentList "/c 1.cmd" -WorkingDirectory c:\test
Blah
$installerPath = [IO.Path]::Combine($LocalModulePath, 'Install.ps1')
Write-Host "Installer path: $installerPath"
if (Test-Path $installerPath) {
Write-Host 'Install.ps1 exists. Running Install.ps1'
& $installerPath
}
Blah
Write-Host "Installing module..."
$eventSource = 'My.Module.Manager'
try {
$sourceExists = [System.Diagnostics.EventLog]::SourceExists($eventSource)
} catch [Security.SecurityException] {
Write-Verbose "Caught 'SecurityException': $_.Exception.Message"
}
if ($sourceExists) {
Write-Host "...installation complete..."
} else {
#region ----- Ensure-ProcessIsElevated -----
if ($Verbose) {
$VerbosePreference = "Continue"
}
if ($Debug) {
$DebugPreference = "Continue"
}
Write-Debug "Command line is ___$($MyInvocation.Line)___"
Write-Verbose "Entering script body"
if ($ScriptPath) {
Set-Location $ScriptPath
Write-Verbose "Working directory: $pwd"
}
If (-Not ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
Write-Warning "This script must be run with elevated privileges."
Write-Warning "Restarting as an elevated process."
Write-Warning "You will be prompted for authorization."
Write-Warning "You may click 'No' and re-run manually, if you prefer."
If ((Get-WmiObject Win32_OperatingSystem | select BuildNumber).BuildNumber -ge 6000) {
Write-Verbose "This is a UAC-enabled system. Elevating ..."
$CommandLine = "$($MyInvocation.Line.Replace($MyInvocation.InvocationName, $MyInvocation.MyCommand.Definition)) -ScriptPath $pwd"
Write-Verbose "CommandLine: $CommandLine"
Start-Process -FilePath PowerShell.exe -Verb Runas -ArgumentList "$CommandLine"
} else {
Write-Verbose "The system does not support UAC: an elevated process cannot be started."
Write-Warning "This script requires administrative privileges. Please re-run with administrative account."
}
Break
}
Write-Verbose "The script is now running with elevated privileges."
#endregion ----- Ensure-ProcessIsElevated -----
New-EventLog -LogName Application -Source $eventSource
Write-Host "...installation complete..."
}
Read-Host -Prompt "Press Enter to exit"
Blah
Blah
Write-Output "Backups complete at $(Get-Date -Format u)"
Blah
try
{
# Do your script's stuff
}
catch
{
Write-Error $_.Exception.ToString()
Read-Host -Prompt "The above error occurred. Press Enter to exit."
}
Blah
function Log-Message
{
[CmdletBinding()]
Param
(
[Parameter(Mandatory=$true, Position=0)]
[string]$LogMessage
)
Write-Output ("{0} - {1}" -f (Get-Date), $LogMessage)
}
Now you can simple log using:
Log-Message "Starting Backups" Log-Message "Backups Completed"
Output:
22.07.2016 08:31:15 - Starting Backups 22.07.2016 08:31:15 - Backups Completed
To Change Directory:
Set-Location -Path Q:\MyDir
Blah:
Remove-EventLog -Source 'My.Module.Manager'
https://stackoverflow.com/questions/7834656/create-log-file-in-powershell
Put this at the top of your file:
$Logfile = "D:\Apps\Logs\$(gc env:computername).log"
Function LogWrite
{
Param ([string]$logstring)
Add-content $Logfile -value $logstring
}
Then replace your Write-host calls with LogWrite.
OR:
Function Write-Log {
[CmdletBinding()]
Param(
[Parameter(Mandatory=$False)]
[ValidateSet("INFO","WARN","ERROR","FATAL","DEBUG")]
[String]
$Level = "INFO",
[Parameter(Mandatory=$True)]
[string]
$Message,
[Parameter(Mandatory=$False)]
[string]
$logfile
)
$Stamp = (Get-Date).toString("yyyy/MM/dd HH:mm:ss")
$Line = "$Stamp $Level $Message"
If($logfile) {
Add-Content $logfile -Value $Line
}
Else {
Write-Output $Line
}
}
. .\logger.ps1
Write-Log "debug message"
Write-Log "info message" "INFO"
Using this Log-Entry framework:
Script:
Function Main {
Log -File "D:\Apps\Logs\$Env:computername.log"
$tcp = (get-childitem c:\windows\system32\drivers\tcpip.sys).Versioninfo.ProductVersionRaw
$dfs = (get-childitem C:\Windows\Microsoft.NET\Framework\v2.0.50727\dfsvc.exe).Versioninfo.ProductVersionRaw
Log "TCPIP.sys Version on $computer is:" $tcp
Log "DFSVC.exe Version on $computer is:" $dfs
If (get-wmiobject win32_share | where-object {$_.Name -eq "REMINST"}) {Log "The REMINST share exists on $computer"}
Else {Log "The REMINST share DOES NOT exist on $computer - Please create as per standards"}
"KB2450944", "KB3150513", "KB3176935" | ForEach {
$hotfix = Get-HotFix -Id $_ -ErrorAction SilentlyContinue
If ($hotfix) {Log -Color Green Hotfix $_ is installed}
Else {Log -Color Red Hotfix $_ " is NOT installed - Please ensure you install this hotfix"}
}
}