Torben at 20:57, 30 October 2024

2024-10-30T20:57:27Z

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[[Category:Coding]][[Category:Windows]]
===run===
single command
powershell -c "$lastmonth = (Get-Date).addMonths(-3); $lastmonth.tostring(\"yyyy-MM\")"
script file
powershell -executionpolicy bypass -File ./del-old-dirs.ps1

===echo/print===
Write-Host "Hello World"
pause

===date===
get current date e.g. YYYY-MM
powershell -c "$lastmonth = (Get-Date).addMonths(-3); $lastmonth.tostring(\"yyyy-MM\")"

===strings===
get substring of string
$var = 'Hello World'
$result = $var.substring(0, 5)
$result-> Hello
merge stings
$dest = $rootPath + "\" +$subFolder

===filesystem access===
check a dir exists
if (Test-Path $dest) { ... }
del / delete file
Remove-Item -Path "C:\dir\file.txt"
mkdir / create dirctory
New-Item -ItemType directory -Path C:\newDir

====select old files from directory====
$limit = (Get-Date).AddDays(-90)
$scope = Get-ChildItem -Path $dir -Force | Where-Object { $_.PSIsContainer -and $_.CreationTime -lt $limit }
#
# Filters:
# -Filter "*.dfq"
# Where
# $_.PSIsContainer => dirs
# !$_.PSIsContainer => files
#
# write scope to CSV file
$scope | Select-Object FullName, CreationTime | Export-Csv -Path .\$logfile -NoTypeInformation
# -Append
# delete files in scope
$scope | Remove-Item -Force

====delete old files====
delete old files (from [https://stackoverflow.com/questions/17829785/delete-files-older-than-15-days-using-powershell])
$limit = (Get-Date).AddDays(-15)
$path = "C:\Some\Path"
# delete files older than the $limit.
Get-ChildItem -Path $path -Recurse -Force | Where-Object { !$_.PSIsContainer -and $_.CreationTime -lt $limit } | Remove-Item -Force
# delete any empty directories left behind after deleting the old files.
Get-ChildItem -Path $path -Recurse -Force | Where-Object { $_.PSIsContainer -and (Get-ChildItem -Path $_.FullName -Recurse -Force | Where-Object { !$_.PSIsContainer }) -eq $null } | Remove-Item -Force -Recurse

===if / else===
if folder exists
if (Test-Path $dirDone) { ... }

====exit with error code====
exit (1)

===loops===
$dirs = Get-ChildItem -Path .\ -Directory
foreach ($d in $dirs) { ... }

===mount network share===
net use q: \\server\dir1\dir2
net use q: /delete

PowerShell - Revision history

Torben at 20:57, 30 October 2024