Monitor the log file using Get-Content -wait until the end of the day

Question

I have a script monitoring a log file with get-Content, and it expects new lines to be written so that it can detect the change. The registrar changes the name of the log file every day to make it System_ $ date.log.

I am trying to make my Get-Content wait for new lines, and also break when the date changes, and then repeat the execution with a new date in the file name. Does anyone know how to do this?

thanks

Edit

The script looks like this:

Get-Content System_201371.log -wait | where {$_ -match "some regex"} | foreach { send_email($_) } 

The file name, which is System_201371, changes every day, it will be System_201372, etc. Also this script works as a service, I need to break it and re-execute with a new file name

Answer 1

You can use Jobs for this. Read the file in some background task, and let the “foreground” script wait until the day changes. As soon as the day changes, kill the old job and run the new one, looking at the new file.

 while($true) { $now = Get-Date $fileName = 'System_{0}{1}{2}.log' -f $now.Year, $now.Month, $now.Day $fullPath = "some directory\$fileName" Write-Host "[$(Get-Date)] Starting job for file $fullPath" $latest = Start-Job -Arg $fullPath -ScriptBlock { param($file) # wait until the file exists, just in case while(-not (Test-Path $file)){ sleep -sec 10 } Get-Content $file -wait | where {$_ -match "some regex"} | foreach { send_email($_) } } # wait until day changes, or whatever would cause new log file to be created while($now.Date -eq (Get-Date).Date){ sleep -Sec 10 } # kill the job and start over Write-Host "[$(Get-Date)] Stopping job for file $fullPath" $latest | Stop-Job } 

Answer 2

This should always keep track of today's log and detect a date change:

 do{ $CurrentDate = get-date -uformat %Y%j $CurrentLog = ("C:\somepath\System_" + $CurrentDate + ".log") Start-Job -name Tail -Arg $CurrentLog -Scriptblock{ While (! (Test-Path $CurrentLog)){ sleep -sec 10 } write-host ("Monitoring " + $CurrentLog) Get-Content $CurrentLog -wait | where {$_ -match "some regex"} | foreach { send_email($_) } } while ($CurrentDate -eq (get-date -uformat %Y%j)){ sleep -sec 10} Stop-Job -name Tail } while ($true)