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PowerShell snippets

DISM

Clean up component store (Windows update files)
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dism.exe /online /cleanup-Image /AnalyzeComponentStore
dism.exe /online /cleanup-Image /StartComponentCleanup

SSH

Generate ssh key pair
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cd ~
ssh-keygen -t rsa

Alternatives to Linux tools

Replacement for missing ssh-copy-id on Windows
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type C:\Users\username\.ssh\id_rsa.pub | ssh user@192.168.0.1 "cat >> .ssh/authorized_keys"
Replacement for grep
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findstr /b "<?php" *.php

Useful parameters for findstr

  • /b - match string must be at the begin
  • /e - match string must be at the end
  • /s - recursive

Windows services

Get services
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Get-Service | where -Filterscript {$_.StartType -eq 'Disabled'} | ft 'Name','StartType',"Status"
Set startup type of service
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Set-Service -StartupType Automatic -Name <ServiceName>
Start service
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Start-Service <ServiceName>

Active Directory

Sync all domain controllers (PUSH)
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repadmin /syncall /AdeP
Force DFSR sync
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dfsrdiag pollad

Fancy PowerShell

PowerShell profile pathes

Scope Path Profile variable
Current user – Current host $Home\My Documents\PowerShell\Microsoft.PowerShell_profile.ps1 $profile
Current user – All hosts $Home\My Documents\PowerShell\Profile.ps1 $profile.CurrentUserAllHosts
All Users – Current Host $PSHOME\Microsoft.PowerShell_profile.ps1 $profile.AllUsersCurrentHost
All Users – All Hosts $PSHOME\Profile.ps1 $profile.AllUsersAllHosts
Install module PSReadline
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Install-Module PSReadLine
Install module CompletionPredictor
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Install-Module CompletionPredictor
Install OhMyPosh
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winget install JanDeDobbeleer.OhMyPosh

Download OhMyPosh configuration file

Example for Profile.ps1 configuration

Sample for PowerShell profile
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using namespace System.Management.Automation
# Shows navigable menu of all options when hitting Tab
Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete

# Autocompletion for arrow keys
Import-Module CompletionPredictor
Set-PSReadlineKeyHandler -Key UpArrow -Function HistorySearchBackward
Set-PSReadlineKeyHandler -Key DownArrow -Function HistorySearchForward
Set-PSReadLineOption -HistorySearchCursorMovesToEnd
Set-PSReadLineOption -PredictionSource HistoryAndPlugin
Set-PSReadLineOption -PredictionViewStyle ListView
Set-PSReadLineOption -EditMode Windows

# OhMyPosh configuration
oh-my-posh init pwsh --config "C:\Custom\ohmyposh\custom.omp.json" | Invoke-Expression

# Read ssh configuration and enable autocompletion for ssh
Register-ArgumentCompleter -CommandName ssh,scp,sftp -Native -ScriptBlock {
    param($wordToComplete, $commandAst, $cursorPosition)

    function Get-SSHHostList($sshConfigPath) {
        Get-Content -Path $sshConfigPath `
        | Select-String -Pattern '^Host ' `
        | ForEach-Object { $_ -replace 'Host ', '' } `
        | ForEach-Object { $_ -split ' ' } `
        | Sort-Object -Unique `
        | Select-String -Pattern '^.*[*!?].*$' -NotMatch
    }

    function Get-SSHConfigFileList ($sshConfigFilePath) {
        $sshConfigDir = Split-Path -Path $sshConfigFilePath -Resolve -Parent

        $sshConfigFilePaths = @()
        $sshConfigFilePaths += $sshConfigFilePath

        $pathsPatterns = @()
        Get-Content -Path $sshConfigFilePath `
        | Select-String -Pattern '^Include ' `
        | ForEach-Object { $_ -replace 'Include ', '' }  `
        | ForEach-Object { $_ -replace '~', $Env:USERPROFILE } `
        | ForEach-Object { $_ -replace '\$Env:USERPROFILE', $Env:USERPROFILE } `
        | ForEach-Object { $_ -replace '\$Env:HOMEPATH', $Env:USERPROFILE } `
        | ForEach-Object { 
        $sshConfigFilePaths += $(Get-ChildItem -Path $sshConfigDir\$_ -File -ErrorAction SilentlyContinue -Force).FullName `
        | ForEach-Object { Get-SSHConfigFileList $_ } 
        }

        if (($sshConfigFilePaths.Length -eq 1) -and ($sshConfigFilePaths.item(0) -eq $sshConfigFilePath) ) {
            return $sshConfigFilePath
        }

        return $sshConfigFilePaths | Sort-Object -Unique
    }

    $sshPath = "$Env:USERPROFILE\.ssh"
    $hosts = Get-SSHConfigFileList "$sshPath\config" `
    | ForEach-Object { Get-SSHHostList $_ } `

    # For now just assume it's a hostname.
    $textToComplete = $wordToComplete
    $generateCompletionText = {
        param($x)
        $x
    }
    if ($wordToComplete -match "^(?<user>[-\w/\\]+)@(?<host>[-.\w]+)$") {
        $textToComplete = $Matches["host"]
        $generateCompletionText = {
            param($hostname)
            $Matches["user"] + "@" + $hostname
        }
    }

    $hosts `
    | Where-Object { $_ -like "${textToComplete}*" } `
    | ForEach-Object { [CompletionResult]::new((&$generateCompletionText($_)), $_, [CompletionResultType]::ParameterValue, $_) }
}