Created
July 24, 2025 04:28
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Function to parse syslog content using PowerShell
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| function Get-sjSyslog { | |
| param ( | |
| [string]$SyslogPath = "/var/log/syslog" | |
| ) | |
| # Define regex patterns | |
| $regexSystemd = @( | |
| '^', | |
| '(?<Date>\w{3}\s+\d+\s+\d{2}:\d{2}:\d{2})', | |
| '\s+', | |
| '(?<Host>\S+)', | |
| '\s+', | |
| '(?<Process>\w+)', | |
| '\[', | |
| '(?<PID>\d+)', | |
| '\]:', | |
| '\s+', | |
| '(?<Message>.+)', | |
| '$' | |
| ) -join '' | |
| $regexDashM = @( | |
| '^', | |
| '(?<Date>\w{3}\s+\d+\s+\d{2}:\d{2}:\d{2})', | |
| '\s+', | |
| '(?<Host>\S+)', | |
| '\s+', | |
| '-m:', | |
| '\s+', | |
| '(?<Message>.+)', | |
| '$' | |
| ) -join '' | |
| $regexKernel = @( | |
| '^', | |
| '(?<Date>\w{3}\s+\d+\s+\d{2}:\d{2}:\d{2})', | |
| '\s+', | |
| '(?<Host>\S+)', | |
| '\s+', | |
| 'kernel:', | |
| '\s+\[\s*', | |
| '(?<PID>[\d\.]+)', | |
| '\]\s+', | |
| '(?<Message>.+)', | |
| '$' | |
| ) -join '' | |
| # Define year for date parsing | |
| $year = (Get-Date).Year | |
| # Read syslog file | |
| Get-Content $SyslogPath | ForEach-Object { | |
| # Get-Content $SyslogPath | Select -first 20 -Skip 55 | ForEach-Object { | |
| if ($_ -match $regexSystemd) { | |
| [PSCustomObject]@{ | |
| Date = [datetime]::ParseExact("$($matches['Date']) $year", 'MMM dd HH:mm:ss yyyy', $null) | |
| Host = $matches['Host'] | |
| Process = $matches['Process'] | |
| PID = [int]$matches['PID'] | |
| Message = $matches['Message'] | |
| } | |
| } elseif ($_ -match $regexDashM) { | |
| [PSCustomObject]@{ | |
| Date = [datetime]::ParseExact("$($matches['Date']) $year", 'MMM dd HH:mm:ss yyyy', $null) | |
| Host = $matches['Host'] | |
| Process = '-m' | |
| PID = '' | |
| Message = $matches['Message'] | |
| } | |
| } elseif ($_ -match $regexKernel) { | |
| [PSCustomObject]@{ | |
| Date = [datetime]::ParseExact("$($matches['Date']) $year", 'MMM dd HH:mm:ss yyyy', $null) | |
| Host = $matches['Host'] | |
| Process = 'kernel' | |
| PID = $matches['PID'] | |
| Message = $matches['Message'] | |
| } | |
| } else { | |
| [PSCustomObject]@{ | |
| Date = $null | |
| Host = $null | |
| Process = $null | |
| PID = $null | |
| Message = $_ | |
| } | |
| } | |
| } # End of ForEach-Object | |
| } | |
| # test cases | |
| Get-sjSyslog |
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