Public/Resize-Logfile.ps1
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Function Resize-Logfile { <# .SYNOPSIS Cleans the logfile except for the last n rows .DESCRIPTION The logfile, that is defined by $logfile or $Script:logfile needs to be cleaned from time to time. So this function rewrites the file with the last (most current) n lines. .PARAMETER RowsToKeep The number of lines you want to keep .EXAMPLE Clean-Logfile -RowsToKeep 200000 .INPUTS Int .OUTPUTS $null .NOTES Author: florian.von.bracht@apteco.de #> [cmdletbinding()] param( [Parameter(Mandatory=$true)][int]$RowsToKeep #= 200000 ) # TODO [ ] use input path rather than a variable? If ( $null -eq $logfile ) { Write-Warning -Message "There is no variable '`$logfile' present on 'Script' scope" Write-Warning -Message "Please define a path in '`$logfile' or use 'Write-Log' once" } else { # Testing the path If ( ( Test-Path -Path $logfile -IsValid ) -eq $false ) { Write-Error -Message "Invalid variable '`$logfile'. The path '$( $logfile )' is invalid." } else { # [ ] TODO maybe implement another parameter to input date instead of no of rows, use streamreader for this instead # [Datetime]::ParseExact("20221027130112","yyyyMMddHHmmss",$null) # Create a temporary file $tempFile = Join-Path -Path $Env:tmp -ChildPath "$( [guid]::newguid().toString() ).tmp" #New-TemporaryFile # Write only last lines to the new file Get-Content -Tail $RowsToKeep -Encoding utf8 -Path $Script:logfile | Set-Content -path $tempFile.FullName -Encoding utf8 # delete original file If ( (Test-Path -Path $logfile) -eq $true ) { Remove-Item $logfile } # move file to new location Move-Item -Path $tempFile.FullName -Destination $logfile } } } |