Dateien, Text, Regex, Module und Remoting

$dir = Join-Path ([IO.Path]::GetTempPath()) "psdemo_$(Get-Random)"
New-Item -ItemType Directory -Path $dir | Out-Null
Set-Location $dir
"Zeile 1`nZeile 2`nZeile 3" | Set-Content "notiz.txt"
Add-Content "notiz.txt" "Zeile 4"
Get-Content "notiz.txt" | Measure-Object -Line | ForEach-Object Lines
(Get-Content "notiz.txt")[1]
Get-Content "notiz.txt" -TotalCount 2
Test-Path "notiz.txt"; Test-Path "gibt-es-nicht"
New-Item -ItemType Directory "unter" | Out-Null
Copy-Item "notiz.txt" "unter/kopie.txt"
Rename-Item "unter/kopie.txt" "umbenannt.txt"
"a;b`n1;2`n3;4" | Set-Content "daten.csv"
Get-ChildItem | Sort-Object Name | ForEach-Object { "$($_.Name) ($($_.PSIsContainer ? 'Ordner' : "$($_.Length) Bytes"))" }
Get-ChildItem -Recurse -File | ForEach-Object { $_.FullName.Substring($dir.Length + 1) } | Sort-Object
(Import-Csv "daten.csv" -Delimiter ";" | Measure-Object a -Sum).Sum
Get-ChildItem *.txt | Select-String "Zeile 3" | ForEach-Object { "$($_.LineNumber): $($_.Line)" }
Remove-Item "unter" -Recurse
Set-Location ..
Remove-Item $dir -Recurse -Force
Test-Path $dir

4
Zeile 2
Zeile 1
Zeile 2
True
False
daten.csv (12 Bytes)
notiz.txt (32 Bytes)
unter (Ordner)
daten.csv
notiz.txt
unter/umbenannt.txt
4
3: Zeile 3
False

$log = @"
2025-03-01 INFO  Server gestartet
2025-03-01 ERROR Datenbank nicht erreichbar
2025-03-02 INFO  Nutzer mia angemeldet
2025-03-02 WARN  Speicher knapp
2025-03-03 ERROR Zeitüberschreitung
"@ -split "`n"

$log | Where-Object { $_ -match "ERROR" }
($log | Select-String -Pattern "(\d{4}-\d\d-\d\d) (\w+)" | ForEach-Object { $_.Matches[0].Groups[2].Value } | Group-Object | Sort-Object Name | ForEach-Object { "$($_.Name)=$($_.Count)" }) -join ", "
$log | ForEach-Object { if ($_ -match "^(?<datum>\S+)\s+(?<stufe>\w+)") { $Matches.stufe } } | Sort-Object -Unique
[regex]::Matches("a1b22c333", "\d+").Value -join ","
"2025-03-15" -replace "(\d+)-(\d+)-(\d+)", '$3.$2.$1'
"CamelCaseText" -creplace "(?<!^)([A-Z])", '_$1'
$log.Count

2025-03-01 ERROR Datenbank nicht erreichbar
2025-03-03 ERROR Zeitüberschreitung
ERROR=2, INFO=2, WARN=1
ERROR
INFO
WARN
1,22,333
15.03.2025
Camel_Case_Text
5

Get-Module -ListAvailable | Select-Object -First 1 -ExpandProperty Name | ForEach-Object { $_ -ne $null }
(Get-Command -Module Microsoft.PowerShell.Utility | Measure-Object).Count -gt 50
Get-Command ConvertTo-Json | ForEach-Object Source
(Get-Command Get-Date).Version.Major -ge 7

True
True
Microsoft.PowerShell.Utility
True

Find-Module -Name PSReadLine           # in der Gallery suchen
Install-Module -Name Pester -Scope CurrentUser   # installieren
Import-Module Pester
Get-Command -Module Pester

Enter-PSSession -ComputerName server01                      # interaktive Sitzung (WinRM oder SSH)
Invoke-Command -ComputerName s1, s2 -ScriptBlock { Get-Service sshd }
Invoke-Command -HostName linux01 -UserName mia -SSHTransport -ScriptBlock { uname -a }

Invoke-RestMethod https://api.github.com/repos/PowerShell/PowerShell | Select-Object name, stargazers_count
Invoke-WebRequest https://example.com | Select-Object StatusCode
Invoke-RestMethod -Method Post -Uri $url -Body (@{ a = 1 } | ConvertTo-Json) -ContentType "application/json"